D
Step-by-step explanation:
Estimating 1,596 will give you 1,600. Estimating 42 will give you 40. Dividing 1,600 ÷ 40 will give you 40. So, the answer would be D.
f(x) has value 150 at x= 0
and 0 at x= 3
so d(f(x))/dt = slope = -150/3 = -50
your answer would be 12