Texas Instruments TI-92 Getting Started page 5

ENTER. For N = 200, you will find that
and lower case letters in this case.
The contents of any memory location may be revealed by typing just its letter name and then ENTER. And the
TI-92 retains memorized values even when it is turned off, so long as its batteries are good.
5.1.6 Repeated Operations with ANS: As many entry/answer pairs as the history area shows are stored in memory.
The last result displayed can be entered on the entry line by pressing 2nd ANS, while the last entry computed is
entered on the entry line by pressing 2nd ENTRY. This makes it easy to use the answer from one computation in
another computation. For example, press 30 + 15 ENTER so that 45 is the last result displayed. Then press 2nd
ANS ÷ 9 ENTER and get 5 because 45 ÷ 9 = 5.
The answer locations are indexed by ans(#), and the entry locations are indexed by entry(#), where # indicates the
number of the entry/answer. The pairs are numbered with the most recent computation as 1. Hence the number of a
pair changes with each successive computation that is entered. The number of an entry or answer can be found by
using the cursor pad ( ) to scroll up to the entry or answer. The number, which is the same for both the entry and
the answer, is shown on the bottom of the screen.
To use an earlier answer or entry in a computation, to calculate, say 15 times answer 3 plus 75, press 1 5 x A N S (
3 ) + 7 5 ENTER, using the keyboard to type the letters A, N, and S.
With a function like division, you press the ÷ after you enter an argument. For such functions, whenever you would
start a new calculation with the previous answer followed by pressing the function key, you may press just the
function key. So instead of 2nd ANS ÷ 9 in the previous example, you could have pressed simply ÷ 9 to achieve the
same result. This technique also works for these functions: + – × ^ 2nd x
Here is a situation where this is especially useful. Suppose a person makes $5.85 per hour and you are asked to
calculate earnings for a day, a week, and a year. Execute the given keystrokes to find the person's incomes during
these periods (results are shown in Figure 5.7).
Pay Period
8-hour day
5-day week
52-week year
5.1.7 The MATH Menu: Operators and functions associated with a scientific calculator are available either
immediately from the keys of the TI-92 or by the 2nd keys. You have direct access to common arithmetic
operations (2nd , 2nd x
–1 –1
COS , 2nd TAN ), exponential and logarithmic functions (LN, 2nd e
5
Graphing Technology Guide: TI-92
N N +
( 1)
= 20100. Note that there is no distinction made between upper
2
Keystrokes
5.85 × 8 ENTER
× 5 ENTER
× 52 ENTER
Figure 5.7: ANS variable
-1
, ∧), trigonometric functions (SIN, COS, TAN), and their inverses (2nd SIN
Copyright © Houghton Mifflin Company. All rights reserved.
-1
.
Earnings
$46.80
$234
$12,168
x
), and a famous constant (2nd π).
–1
, 2nd