A rectangular prism has length of 4 feet and a width of 7 feet. If the surface area of the prism is 188 square feet, what is its height?
6 ft
5 ft
4 ft
3 ft

Question

anonymous · Answer

2*28 + 2*4*h + 2*7*h = 188
56 + 8h +14h = 188
22h = 188-56 = 132
h = 6
height = 6 feet

anonymous · Answer

Using the surface area formula for a rectangula prism

A=2(lw+lh+hw)

Substitute the known values
188=2(4h+4*7+7h)

grouping similar terms
188=2(11h+28)
188=22h+56
all thats left is to Solve for h