HP 35s HP 35s scientific calculator - User Guide - Page 103
Entering and Evaluating Equations, How You Can Use Equations
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6 Entering and Evaluating Equations How You Can Use Equations You can use equations on the HP 35s in several ways: For specifying an equation to evaluate (this chapter). For specifying an equation to solve for unknown values (chapter 7). For specifying a function to integrate (chapter 8). Example: Calculating with an Equation. Suppose you frequently need to determine the volume of a straight section of pipe. The equation is V = .25 π d2 l where d is the inside diameter of the pipe, and l is its length. You could key in the calculation over and over; for example, calculates the volume of 16 inches of 2 1/2-inch diameter pipe (78.5398 cubic inches). However, by storing the equation, you get the HP 35s to "remember" the relationship between diameter, length, and volume - so you can use it many times. Put the calculator in Equation mode and type in the equation using the following keystrokes: Entering and Evaluating Equations 6-1