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HP -28S Manual Page 25

Advanced scientific calculator.
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The number 30 is removed from level
1,
and its sine, .5, is returned to
level 1. The previous result, 38, remains in level 2.
Calculate 38 x .5.
The numbers 38 and .5 are removed from levels 1 and 2, and their
product, 19, is returned to level 1.
This completes the calculation:
(15
+
23) x sin 30°
=
19.
To summarize, here's a general procedure for the calculation you just
completed.
1. Key a number into the
command line.
2. Press
I
ENTER
I to put a number on the
stack.
3. Press the key to execute the command. (If the command doesn't
appear on the keyboard, select the
menu
that contains the com-
mand, and press the
menu key
below the appropriate
menu label.)
The previous example demonstrated that all calculations occur on the
stack. To highlight this idea, you pressed
I
ENTER
I to put every number
on the stack. In practice,
you need to press
I
ENTER
I
only to separate two
numbers keyed in sequentially-in
the example, to separate 15 and 23.
Try repeating the example, omitting the second and third
I
ENTER
Is.
24
1: Getting Started

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