what is value of ( p + q ) / ( p - q ) if p / q = 7 ?
explanation : ( p + q ) / ( p - q ) = ( p / q + 1 ) / ( p / q - 1 ) = ( 7 + 1 ) / ( 7 - 1 ) = 4 / 3 . answer : c
divide(add(7, const_1), subtract(7, const_1))