Asher began working through the problem using the steps. His work is shown. 1. Write the formula. V = lwh 2. Substitute for the known values. 210 = l(3)(5) A prism has a length of l, width of 3 feet, and height of 5 feet. A prism has a width of 3 feet, a height of 5 feet, and a volume of 210 ft3. Which equation shows the length of the rectangular prism? l = (StartFraction 210 Over 3 EndFraction) 5 l = StartFraction 210 Over 15 EndFraction l = 210(15) l = (StartFraction 210 Over 3 EndFraction) 3