Answer:
78
Step-by-step explanation:
Given the formula for the surface area of the prism, that is
SA = 2s² + 4sh
Substitute s = 3 and h = 5 into the formula and evaluate
SA = 2(3)² + 4(3)(5)
= 2 × 9 + 4 × 15
= 18 + 60
= 78
