HP 9g Graphing Calculator - Manual (Page 81)

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Example 59
Create three subroutines to store the following formulas and then use the
GOSUB-PROG command to write a mainroutine to execute the
subroutines.
Subroutine 1 : CHARGE = N × 3
Subroutine 2 : POWER = I A
Subroutine 3 : VOLTAGE = I ( B × Q × A )