Answer:
D
Step-by-step explanation:
90/40 is 2.25, so each task takes 2.25 minutes. Therefore, 10 tasks takes 22.5 minutes.
10 tasks in 22.5 minutes
90/40
= 2.25 tasks/minute
22.5/10
2:7
38 + 14 = 52
52 x 16 = 832
832 divided by 2 = 416
Formula of a trapezoid:
B1(base 1) + B2(base 2) x H(height) x 1/2(basically just dividing by 2)
