# HP -22S Owner's Manual Page 71

Scientific calculator.

2.5
1
INPUT !
16
1
INPUT !
=.25 x fI' x 0 A 2 x L
V=.25xfI'XOA2XL
O?value
0=2.5000
L
?value
L=16.0000
V=78.5398
v
scrolls off left side of
the display.
1
INPUT ! stores equation.
Prompts for (requests)
D;
value
is
the current
value of D.
Stores D, prompts for
L.
Stores L, calculates V
in cubic inches.
To calculate
V,
the HP-22S
evaluates
the right side of the equation.
I
EVAL ! automates keystrokes you would otherwise have to do repeat-
edly for each calculation.
I
SOLVE !lets you solve equations for any variable without rearranging
the equation. For example, you might wonder what length of 21f2-inch
pipe holds 40 cubic inches of water. Assuming you've just completed
the previous keystrokes:
Keys:
Display:
Description:
.1
SOLVE!
o
L V
unknown variable.
{L}
V?78.5398
Selects L, prompts for
V.
40
1
INPUT!
V=40.0000
Stores V, prompts for
012.5000
D.
1
INPUT!
0=2.5000
Retains previous D,
SOLVING
calculates L.
L=8.1487
6: Evaluating and Solving Equations
71