Answer:
B
Step-by-step explanation:
Formula
1/2*h(b1+b2)
Substitute 5 for h, 7 for b1 and 10 for b2
1/2*5(7+10)
Add 7 and 10 together
1/2*5(17)
Divide 5 by 2
2.5(17)
Multiple
42.5
