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1-16 Operating the TI-80
When an expression is evaluated successfully from the Home screen or from a
program, the TI
.
80 stores the answer to a variable, ANS (Last Answer). ANS may
be a decimal number, a fraction, or a list. When you turn the TI
.
80 off, the value
in ANS is retained in memory.
You can use the variable
ANS
to represent the last answer in
most places. When you press
y
±
, the variable name
ANS
is copied to the cursor location. When the expression is
evaluated, the TI
-
80 uses the value of
ANS
in the calculation.
Calculate the area of a garden plot that is 1.7 meters by 4.2
meters. Then calculate the yield per square meter if the plot
produces a total of 147 tomatoes.
1.7
p
4.2
¸
147
e
y
±
¸
You can use the value in
ANS
as the first entry in the next
expression without entering the value again or pressing
y
±
. On a blank line on the Home screen, enter the function.
The TI
-
80 “types” the variable name
ANS
followed by the
function.
5
e
2
¸
p
9.9
¸
To store an answer, store
ANS
to a variable before you
evaluate another expression.
Calculate the area of a circle of radius 5 meters. Then
calculate the volume of a cylinder of radius 5 meters and
height 3.3 meters. Store the result in the variable
V
.
y
T
5
a
¸
p
3.3
¸
§
?
V
¸
Last Answer
Using Last
Answer (ANS) in
an Expression
Continuing an
Expression
Storing Answers
42


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