Cary calculated the surface area of a box in the shape of a rectangular prism. She wrote the equation to represent the width and height of the box. She solved for ( w ) and got ( /A/h = w ). Which of the following is an equivalent equation?
a) ( w = /A/h )
b) ( h = /A/w )
c) ( A = hw )
d) ( w = /A/h² )