The formula for the surface area of a rectangular prism with a square base is SA = 2s2 + 4sh. What is the surface area of this rectangular prism if s = 3 and h = 6?
To find the surface area of the rectangular prism, we substitute the given values into the formula.
Substituting s = 3 and h = 6 into the formula SA = 2s^2 + 4sh gives SA = 2(3)^2 + 4(3)(6).
Simplifying this expression gives SA = 2(9) + 4(3)(6) = 18 + 72 = <<2*9+4*3*6=90>>90.
Therefore, the surface area of this rectangular prism is 90 square units. Answer: \boxed{90}.