Raising Numberstopowers - HP -67 Owner's Handbook Manual

104 Function Keys
Example 2: Having lost most of his
equipment in a blinding snowstorm,
ace explorer Jason Quarmorte is using
an ordinary barometer as an altimeter.
After measuring the sea level pressure
(30 inches of mercury) he climbs until
the barometer indicates 9.4 inches of
mercury. Although the exact relation-
ship of pressure and altitude is a
function of many factors, Quarmorte
knows that an approximation is given by the formula:
Altitude (feet) = 25,000 ln—l— = 25,000 /n 30
Pressure
Where is Jason Quarmorte?
Solution:
Press Display
30
9.4 &
o
25000
0 Altitude in feet.
Quarmorte is probably near the summit of Mount Everest (29,028
feet).
Raising Numbers to Powers
The (%) keyis used to raise numbers to powers. Using [J permits
you to raise a positive real number to any real power—that is, the
power may be positive or negative, and it may be an integer, a
fraction, or a mixed number. [ also permits you to raise any
negative real number to the power of any integer (within the cal-
culating range of the HP-67, of course).