Texas Instruments TI-84 PLUS SILV Guidebook - Page 18

Using the Mode Screen to turn the clock on 1. If the clock is turned off, Press † to highlight TURN CLOCK ON. 2. Press Í Í. Using the Catalog to turn the clock on 1. If the clock is turned off, Press y N 2. Press † or } to scroll the CATALOG until the selection cursor points to ClockOn. 3. Press Í Í. Turning the Clock Off 1. Press y N. 2. Press † or } to scroll the CATALOG until the selection cursor points to ClockOff. 3. Press Í Í. Entering Expressions and Instructions What Is an Expression? An expression is a group of numbers, variables, functions and their arguments, or a combination of these elements. An expression evaluates to a single answer. On the TI-84 Plus, you enter an expression in the same order as you would write it on paper. For example, pR2 is an expression. You can use an expression on the home screen to calculate an answer. In most places where a value is required, you can use an expression to enter a value. Chapter 1: Operating the TI-84 Plus Silver Edition 11