The TI-84 Calculator is designed to help students and professionals with complicated mathematical calculations. Compute Mean, Median and Mode. User rating, 4. Press ENTER to enter Solver Mode. beginners as well. Texas Instruments TI-83 Plus Graphing Calculator Class Set Teacher 10 Pack. TI-84 Plus by Texas Instruments. The slim design of this Texas Instruments calculator makes it easy to carry with you from class to class. Test our free trials first. Chapter 1: Operating the TI-84 Plus Silver Edition 2 TI-84 Plus Silver Edition Using the Color. Both models utilize the Zilog Z80 processor, but the TI-84 operates at over double the speed of the TI-83. Repeatedly press [ENTER] to generate more random integers. Everything you know and love about the TI-84 Plus CE graphing calculator is now infused with the. This graphing calculator 84 plus emulates as an emulator 84 plus, students can use as an instruments tools for homework. Yes, these handy tools are recommended for math classes from pre-algebra onward, and higher education applications that include physics, calculus or data frequently need a ti 84 calculator online or other. This sleek and colorful calculator has all the features of the TI-84 Plus, but with a high-resolution, full-color backlit display that makes graphs and data easy to read. It also comes with a rechargeable battery and a USB cable for easy connectivity. The flexibility you want. There are apps that emulate a TI-84 on iOS and I’m sure there are on android as well. This page lists every TI-84 calculator tutorial available on Statology. Explore math with our beautiful, free online graphing calculator. Calc King is a blog all about the TI-84 Plus line of graphing calculators, including reviews, hacks, programs, apps, games and more. To analyze one-variable data, follow these steps: Enter the data in your calculator. Press the MATH key, followed by the 4 key. Texas Instruments TI-84 Plus Graphing Calculator 10-Digit LCD. Or fastest delivery Tomorrow, Nov 8. Effectiveness: 4. The following list shows you what each Zoom command does:. To select items in the first, fifth, and eighth rows, place the cursor on the desired item and press [ENTER. This app comes pre-installed onto the Python version of the TI-84 Plus CE graphing calculator. In case that you need to have advice on adding or even final review, Graph-inequality. After entering all lines of code, exit the editor, press the PRGRM button, and select your program. The Kindle's screen. Type your function or equation into the text box on the left. TI 84 Calculator Tutorial for Macon State College. Removing a Faceplate 1. Includes all the functions and options you might need. Thanks in advance! 2 2. Page 353 Connecting Two Graphing Calculators with a USB Unit-to-Unit Cable or an I/O Unit-to-Unit Cable USB Unit-to-Unit Cable The TI-84 Plus USB link port is located at the top right edge of the graphing calculator. In some ways this was better than a cell phone: If. Press [ENTER] to generate the first random integer. Whether you want to program the quadratic formula or solve triangles, math programs can help you speed up your problem solving capabilities, giving you an edge over your competition. It's practically the same thing. Then scroll down to LinReg (ax+b) and press ENTER. The TI-83 Plus is an easy-to-use basic graphing calculator that features a high-contrast gray scale display. Here are the steps to set your graphing window: Press [WINDOW] to access the Window editor. What is CEmu? CEmu is a third-party TI-84 Plus CE / TI-83 Premium CE calculator emulator, focused on developer features. Texas Instruments - TI-84 Plus Graphing Calculator - Blue. The transcendental numbers π and e are respectively located in the fifth and sixth rows of the last column of the keyboard. Unlike laptops and tablets, the TI-84 Plus CE Python graphing calculator does not have any distractions like Wi-Fi, Bluetooth or a camera, keeping. LTGEM EVA Hard Case Compatible with Texas Instruments TI-84 Plus CE/TI-84 Plus/TI-Nspire CX II CAS/TI-Nspire CX II/TI-83 Plus/TI-89 Titanium/TI-85 / TI-93 Color Graphing Calculator. $ 9400. With a high-resolution screen and preloaded apps, the TI-84 Plus CE color graphing calculator provides you with the tools you need to quickly solve a variety of equations and problems. Use the system of equations to augment the coefficient matrix and the constant matrix. Pressing [ZOOM][7] or [ZOOM][0] to have the calculator graph the function using the ZTrig or ZoomFit command produces similar results. User-defined engines can also be added. TI-84 Plus Silver Edition nspired. The slim design of the TI 84 calculator Plus CE makes it easy to carry with you from class to class. go ask your school library if they have any that can be checked out. (2,854) $139. Capable of performing 10 graphing functions and preloaded with a slew of helpful apps, the TI-84 is a must-have tool for those who do their exploring. This 8 Hour comprehensive 3-DVD course teaches you how to use all of the major functions of the TI-84 / TI-83 graphing calculator by working example problems. Press [1] or [ENTER] to display the TVM Solver. Master Your Calculator. Developed by Brandon Sterner, Dan Englender and Fred Coughlin, and Jason Kovacs. Explore math with our beautiful, free online graphing calculator. jsTIfied is an online TI-73, TI-76. Under the Technology drop-down menu, select TI-84 Plus Family, TI-83 Plus Family. The program is highly recommended. Make a note of the directory in which you save the download file. Emulated physics. Latest update: Oct 29, 2023. com online calculator provides basic and advanced mathematical functions useful for school or college. Solve advanced problems in Physics, Mathematics and Engineering. 49 each. Your email address will not be published. TI-84 Plus Online Calculator Simulator. com and figure out lesson plan, multiplying and dividing rational and a great many additional algebra topics. graphing calculator ti 84 online - Texas Instruments. The Solver is also capable of solving an equation for one variable given the values of the other variables. Press [2nd] [MATH] to access the Test menu. 8 out of. 919896124: This is the t test-statistic. 9 grade math test. Access the TVM Solver. 300+ bought in past month. Add to cart. to close. Our library contains software for both the TI-84 and TI-Nspire series. σ = population standard deviation. You can access this function on a TI-84 calculator by pressing 2nd and then pressing vars. Keyboard Mapping for the TI-84 Plus CE online calculator. It is a 5. GraphCalc is the best free online graphing calculator that almost completely replaces the TI 83 and TI 84 plus calculators. SourceCoder 3 is an online editor, IDE, and emulator for TI-BASIC, Assembly, and C. I have a few questions that I'm hoping you kind folks can help me with before I endorse the. and/or the TI-84 Plus CE. The Equation Solver on your TI-84 Plus calculator is a great tool for solving one-variable equations. The TI-84 calculator offers various tests to calculate a p-value, such as the t-test, chi-square test, F-test, and z-test. Example: One-Way ANOVA on a TI-84 Calculator. Zoom commands. Step 6: Click “vt83. Save $5, when you spend $20 or more on Books. Calculus Program For TI-84 Plus This is the Calculus Program for TI-84 Plus: calculus. The Texas Instruments TI-84 Plus Graphing calculator 10-Digit LCD has eight display lines, includes a USB computer cable and is fully compatible with TI-83 Plus; More than a dozen preloaded apps. The TI-84 marks a substantial step forward in terms of display technology, embracing a 320×240 pixel screen. Explore math with our beautiful, free online graphing calculator. Press STO followed by → or ALPHA letter key to store a value and use RCL key followed by ALPHA letter key to. Press "Enter" to access the finance app. Though we prefer you use your TI-84 to do calculations, this site offers some free online tools to help with your mathematical endeavours. Systems of Equations. Add to Cart. The functionality you need. Rating 4. All you have to do is highlight CALCULATE and press ENTER. Press and hold down these three keys simultaneously: Clear (located at upper right), APPS (found at middle left), and VAR-LINK (directly beneath APPS). Jan 26, 2022 · Entering an angle in degrees in Radian mode. You can use your keyboard's Numpad to enter. It will take a few seconds to transfer, the. When purchased online. The TI-84 Calculator is one of the most versatile graphing calculators that a student may use, and excels in Algebra, Trigonometry, and Calculus with numerous functions to help the student calculate answers quickly and easily. Click Extract all. Scroll over to "MATH" and then press 5. Note: The TI-84 allows you to enter up to six different lists of data sets. pdf Then then. TI-84 Plus CE Online Calculator. Press enter. Turn off your device by holding down the 2nd key and then pressing the ON button. Next, we will perform the Chi-Square goodness of fit test. 10K+ bought in past month. This item: Texas Instruments TI-84 Plus CE Graphing Calculator, Black. Low Price Guarantee. Explore math with our beautiful, free online graphing calculator. Then drag all 13 files into the TI Connect CE app on your laptop (with calculator plugged in) Now on your calculator simply press Prgm and select AutoCalc and hit enter and it will load up. Your TI-84 will now be reset and restored to the original factory settings. Go to [STAT] "CALC" "8: LinReg (a+bx). Welcome to the graphing calculator graph graph! To graph, write an equation in the "Y =", "PAR", or "POL" folders. On the TI-84 Plus you can enter and use several types of data, including real and complex numbers, matrices, lists, functions, stat plots, graph databases, graph pictures, and strings. Click here to learn more! Institution Download. TI-84 Plus: For Use With (Application) Pre-loaded software applications- all to help you gain an academic edge from pre-algebra through calculus, as well as biology, chemistry and physics: SDS. Your screen should look like this: Press ENTER once. Select the appropriate language. Then press 1-Var Stats. The light colored keys are the number keys. Texas Instruments TI-83 Plus Programmable Graphing Calculator (Packaging and Colors May Vary) 4. Texas Instruments TI-84 PLUS CE Graphing Calculator, Black - OPEN BOX (10) 10 product ratings - Texas Instruments TI-84 PLUS CE Graphing Calculator, Black - OPEN BOX $1,499. Offers a multi-line display with diverse graph styles. But with more families than ever facing financial hardships, I'm looking for potential alternatives. (Note: some older models of the TI83 calculators have a MATRIX button) Use the right arrow key to go to the EDIT menu. Switch between full-color TI-84 Plus CE and the traditional TI-84 Plus screen. If you do want to use your personal calculator but don’t know how to use it, visit the TI-84 Plus page for beginner to advanced tutorials. "Programming the TI-83 Plus/TI-84 Plus". X 13/16 in. Downloads for the TI-84 Plus CE graphing calculator. Then scroll down to X2-Test and Press Enter. How to Find Sample Variance on a TI-84 Calculator. interactive geometry software. The table shows the types of regression models the TI-84 Plus calculator can compute. Graphing Calculator Case for Texas Instruments TI-84 Plus CE/TI-83 Plus CE/TI-84 Plus/Casio fx-9750GII, Storage Box Protective Pouch with Zipped Pocket for USB Cables, Pencil, Ruler, Manual, (Black) 4. Vector Math Program for TI-84 Plus; Kinematic Equations Program for TI-84 Plus; About this site. TI-84 CALCULATOR ONLINE Access the free TI-84 Calculator Online below, for Windows Computers, Macs and even Smart Phones. WYNGS Protective Case for TI 84 Plus/TI 83 Plus/Casio FX-9860GII / Casio FX-9750 GIII/Casio PRIZM FX-CG 50 Graphing Calculator in Black $14. TI-84 Natural Language Math Input Extended Keyboard Examples Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students &. This system is the property of Sierra College and by logging in you agree to. Best Free Online Graphing Calculator. Be sure to double check with your teacher. Includes functions such as financial, trigonometry, statistical, graphic, forecasting. Get the core functionality of a TI-84 Plus CE graphing calculator in a browser-based online portal. • The app shows the exact key press sequence for 28 topics of Differential Calculus, Solve Equations, Integral Calculus, Matrices and Tips! • You can swipe through screenshots of the. It's commonly the case that differential equations classes are looking for symbolic functions as opposed to numerical solutions, in which case you would need a calculator that did those. TI-84 Calculator by Texas Instruments. Press Stat and then scroll over to TESTS. 8 out of 5 stars with 2833 reviews. Next, press Stat and then scroll over to the right and press CALC. Includes Full-color, backlit display; Familiar TI-84 Plus functionality that's easy to learn; TI Rechargeable Battery; Importing of color images - even your own photos. Pinterest Youtube Tiktok Terms CA Supply Chain. Lastly, highlight Calculate and press ENTER. All you have to do is highlight CALCULATE and press ENTER. 96x64 LCD: Thanks in part to research from the PindurTI emulator, emulates very accurate LCD physics, which makes grayscale look good and calculations and graphs look authentic. BOVKE Hard Graphing Calculator Case Compatible with Texas Instruments TI-84 Plus CE/TI-84 Plus/TI-83 Plus CE/Casio fx-9750GII, Extra Zipped Pocket for USB Cables, Manual, Pencil, Ruler, Black 4. Are there any resources at all that work? command_block_guy. -This Solver is part of the Algebra Made Easy app. TI-84 Plus CE Online Calculator. com is undoubtedly the perfect site to explore!. BOVKE Hard Graphing Calculator Case Compatible with Texas Instruments TI-84 Plus CE/TI-84 Plus/TI-83 Plus CE/Casio fx-9750GII, Extra Zipped Pocket for USB Cables, Manual, Pencil, Ruler, Black 4. I have designed a PCB to specifically fit the dimensions of the USB Mini footprint on the ti-84. Emulates a TI-84 graphing calculator on your Windows or Macintosh computer. Unlike laptops and tablets, the TI-84 Plus CE Python graphing calculator does not have any distractions like Wi-Fi, Bluetooth or a camera, keeping. It is packaged as a Flash Application, which means it only runs on the TI-83+ and TI-84+ (sorry regular TI-83 users!). 8 out of 5 stars with 2828 reviews. To access this mode, first press the MATH button on your calculator, then hit the up arrow button to move the cursor directly to the bottom of the list. Welcome to the graphing calculator graph graph! To graph, write an equation in the "Y =", "PAR", or "POL" folders. This is where you set the clock on the TI-84 Plus family of calculators. A summation notation Ti-84 template will be displayed. 8 out of 5 stars. Press Stat and then scroll over to CALC. User rating, 4. Mario 2. How to Find a Five Number Summary on a TI-84 Calculator. This free on-line graphing calculator is available to you 24hrs / 7days a week. beginners as well. TI-84 Online Calculator Step by Step Math & Science Apps for the TI-89 Become a Wizard! Improve Understanding! Boost your Grade! For Math & Science Test Prep, Homework. Download Texas Instruments handheld OS. Depending on the age of your TI-84 Plus, the Solver Mode screen. A window should pop up showing that your calculator is connected via USB, press Select, and the TI Device Explorer should open up. Runs on TI-Nspire CX, TI-Nspire CX CAS, TI-Nspire CX II and TI-Nspire CX II CAS only. Sold by Baoweikai Ltd and ships from Amazon Fulfillment. STEP 2 – Install Wabbit on your Mac. Texas Instruments Unveils the TI-84+ CE; Super Smash Bros. Free shipping. keys to move from item to item. Then press 1-Var Stats. I have researched every Math software on the net. Detailed answers/keystrokes for all examples are at the end of each section. Zoom Fit, Zoom Standard, ZBox Functions on the TI-84. Using your TI84 Calculator, you can compute factorials this way: To compute 5! (which is 5*4*3*2*1=120) press 5 , next press MATH and scroll right to PRB (Probability) , next select option 4:! as shown below: Pressing ENTER gets you the correct solution:. Easy to use and 100% Free! We also have several other calculators. Then go to Plot 1 and choose the Scatter Plot Icon in Type. Descriptive Statistics. Next, we will find the line of best fit. Located under 5:Settings → 4:Status → About ID may look like: 1008000007206E210B0 BD92F455. All the best games for the TI-84 Plus CE Calculator. Compute Mean, Median and Mode. In this equation, x=days since 22 March 2014. simplifying rational expressions calculator. Operating System. 5 Inch. Preloaded with more software for classes including Cabri Jr. 16, 17. The TI-83 has not been updated since 2001 whereas the TI-84 keeps being updated. Test our free trials first. The key difference between the TI-83 and the TI-84 is the operating system: the TI-83 comes with factory-standard software and the ability to upgrade. TI-84 Plus Silver Edition Using the Color. Enter a number using scientific notation. Your TI-84 will now be reset and restored to the original factory settings. TI-84 Calculator by Texas Instruments | Desmos. When you have only one boundary, which means you're computing area in a tail, use ∞ or −∞ as the other boundary. 4) Yscl = 0. Great calculator but some bugs This calculator is a great way to avoid spending $120-$200 on a Ti84 calculator. TI-84 Plus CE BASIC Programs; These files are for the TI-84 Plus CE, 83 Premium CE, and other "CE" calculators with color screens. and/or the TI-84 Plus CE. Press [1] or [ENTER] to display the TVM Solver. at: https://www. Download for TI-83 Download for TI-83+/TI-84+ Recent Articles. Step 6: Click “vt83. Intermediate 2 maths past papers free, ti-84 calculator program instructions, printable lattice multiplication boxes, algerbra, "simple interest worksheets" edhelper. 49 each. solitaire without download, p o r n o x o
Includes all the functions and options you might need. . Ti84 online
Shop Target for ti-84 plus ce you will love at great low prices. or Best Offer. fr, TI-81, TI-82, TI-82 Stats. If you need a dependable and powerful calculator the TI 84 Plus graphing calculator is here to help. Welcome to a fast and modern graphing calculator app. The payment is $1,000 per year in our example while the interest rate is 9% annually. Systems of Equations. Texas Instruments TI Calculators. fractions and decimals papers online. Based on your data type and research question, choose the appropriate test. Step 2: Perform linear regression. Easy to use and 100% Free! We also have several other calculators. 6 out of 5 stars 1,162. Texas Instruments NAVN3/CRK30/2L1 Ti Nspire Cx Navigator 30 User. In Stock. The TI-84 is an enduring classic - the calculator that took many through high school, college and beyond. 00 Texas Instruments TI-84 Plus CE Graphing Calculator, Blue. We have made it our mission to bring all of the greatest TI-84 Calculator tips and tricks to the masses. $35 $200. (To highlight an item in the Mode menu, use the arrow keys to place the cursor on the item, and then press [ENTER]. The slim design of the TI 84 calculator Plus CE makes it easy to carry with you from class to class. Best ti 84 calculator online We have the most sophisticated and comprehensive TI 84 type graphing calculator online. TI-84 Calculator Tutorial - 8 Hour Course. The slim design of a TI-84 Plus CE makes it easier to carry, and each purchase includes a rechargeable battery, charger, and USB cable. Top 10 Reason to get a TI-84 PLUS CE. The TI-89 is one of the highest model lines in TI's calculator products, along with the TI-Nspire. Or fastest delivery Tomorrow, Nov 8. Press and hold down these three keys simultaneously: Clear (located at upper right), APPS (found at middle left), and VAR-LINK (directly beneath APPS). Get the Texas Instruments TI-84 Plus 10-Digit Graphing Calculator on sale for just $120, marked down from its regular price of $128 so you can save $8; or choose the Texas Instruments TI-84 Plus. TI-84 Plus CE online calculator Operating System and Apps Guide. For example, calculating simple arithmetic using the multiplication symbol will look like this: 2. TI-84 Plus by Texas Instruments. PuzzPack is a collection of the best puzzle games on the TI-83+ and TI-84+. Access the app menu: On your TI-84 Plus calculator, navigate to the app menu by pressing the "APPS" key located on the calculator's keypad. 1 divided by standard deviation (For standard ND, use 0. Texas Instruments TI-84 Plus Graphing Calculator 8 Line (s) - 16 Character (s) - Battery Powered - Black, 1 Each. This tutorial explains how to perform quadratic regression on a TI-84 Calculator. The slim design of this Texas Instruments calculator makes it easy to carry with you from class to class. "7th grade taks math", TI-83 plus instructions summation notation, ontario grade 8 mathematics exam, first order different equation, trigonometric ti84, free online grade 6 math/probability, combination worksheets. Item #145872 (391) $145. A Chrome™ browser-based web app that emulates a TI-84 Plus CE graphing calculator on Windows®, macOS®, and Google Chromebook™ computers. TI-83/84 Plus Calculator Screen (x =-2pi<x<2pi) (y=-4<x<4) | Desmos. The keys along the right side of the keyboard are the common math functions. The Texas Instruments TI-84 Plus CE Calculator comes with a vibrant, backlit colour screen so you can visualise concepts and make connections between equations, data and graphs. Though we prefer you use your TI-84 to do calculations, this site offers some free online tools to help with your mathematical endeavours. Don't miss this fantastic port of the classic game. σ = population standard deviation. Solve your Homework questions quickly in Algebra, Calculus, Statistics and Geometry. Step 2: Perform a Chi-Square Test of Independence. TI84CalcWiz – TI-84 Games, Programs, Hacks, and Tutorials. Operating system: Windows XP/Vista/7/8/10/11. ---Step by Step to Success. TI-84 Factorial Calculation. Square root your previous answer. 1- Stat – Tests – “a PropZtest” enter data requested, press “calculate”. Press 'ENTER' after each entry. This subscription-based app lets you tackle math and science problems anytime, from any computer, with just a click of your mouse. A beautiful, free online scientific calculator with advanced features for evaluating percentages, fractions, exponential functions, logarithms, trigonometry, statistics, and more. Math calculator features: 200+ functions, multi-line display. Access the TVM Solver. Turn off your device by holding down the 2nd key and then pressing the ON button. com 6) Freely Download TI84 Plus CE Apps for Math, Science and more at Downloads 7) Join free TI84 Plus CE webinars and learn how to get the most of your TI84 PLUS CE at Webinars. Security & Fraud. January 3, 2013. Calculations for Individuals. Solve advanced problems in Physics, Mathematics and Engineering. TI-84 Plus Graphing Calculator. Below is a TI-84 Plus Silver Edition rom that can be used for Wabbitemu, Almost Ti, and other TI calculator emulators. TI-83 Plus and TI-84 Plus family (including the TI-84 Plus C Silver Edition): jsTIfied and Wabbitemu. You can use your keyboard's Numpad to enter. High-quality synthesized speech reads out all textual and symbolic information on the LCD screen, as well as each key-press. Access the TVM Solver. Lastly, highlight Calculate and press ENTER. Denver, CO. TI-84 Calculator Tutorial - 8 Hour Course. TI-84 Plus: For Use With (Application) Pre-loaded software applications- all to help you gain an academic edge from pre-algebra through calculus, as well as biology, chemistry and physics: SDS. Beski A4 Math 3 Art Project DUE: DECEMBER 14, 2012 Drawing: TI-84 Calculator by Texas Instruments. The TI-84 Plus CE Python-edition calculator is the latest release of the popular TI-84 Plus family of graphing calculators. Comes with slide case. y = x2. In case that you need to have advice on adding or even final review, Graph-inequality. The light colored keys are the number keys. Developed by Brandon Sterner, Dan Englender and Fred Coughlin, and Jason Kovacs. (6204) $6. Click below to start. Click Clear to get started. Up to ten graphing functions defined, saved, graphed and analyzed at one time. Understanding the Keypad Layout The keypad is. Texas Instruments - TI-84 Plus Graphing Calculator - Blue Texas Instruments - TI-84 Plus Graphing Calculator - Blue. Press "Enter" to access the finance app. TI-83 Online Calculator. CAS is an improvement over traditional calculators which require x to have a numerical value. Step 3: Find the correlation coefficient. This emulator is a free online version of the NumWorks graphing calculator. News & Blog Target Brands Bullseye Shop Target's Coronavirus Response Sustainability & ESG Advertise with Us Affiliates & Partners. It's the ideal tool for class presentations and for remote learning. Choose an option. 5 Inch. The new TI-84 Plus CE Python graphing calculator includes familiar features like a full-color screen, lightweight design and a rechargeable battery that can last up to a month on a single charge. We would like to show you a description here but the site won't allow us. ) Enter your trigonometric functions into the Y= editor. Jul 27, 2021 · The new TI-84 Plus CE Python graphing calculator includes familiar features like a full-color screen, lightweight design and a rechargeable battery that can last up to a month on a single charge. Click here: Online FREE TI-84 Plus Graphics Calculator! Preloaded with software, including Cabri Jr. Pressing [CLEAR] deletes the line containing the cursor. zip file) Step Two: Open TI Connect CE, and click the “Calculator Explorer” tab on the sidebar. The design of this calculator is inspired by popular physical calculators such as ti-83, ti-84, ti-89 and ti-30x. The TI Connect software will transfer the file from your computer to your calculator. Type in an. TI-84 + multiple equation solver programs. Check out your graph. The TI-84 Plus CE online calculator state contains the following: • CE Operating System v 5. Or fastest delivery Fri, Dec 15. 0 stars. WYNGS Protective Case for TI 84 Plus/TI 83 Plus/Casio FX-9860GII / Casio FX-9750 GIII/Casio PRIZM FX-CG 50 Graphing Calculator in Black. TI-89 graphing calculator simulator. Type these numbers, pressing [ENTER] after each. If you choose the 83 Plus, I would check out swap meets, pawn shops, online, etc. Learn how to use the calculator with step-by-step video examples; Trustpilot. Easily solve Algebra Problems Online. . mujeres mexicanas cojiendo