If the company makes 50 deliveries in 5 days, he makes 50/5=10 deliveries per day. Therefore, 400 deliveries will take 400/10=40 days. D is the correct answer.

3 0

3 years ago

PLZ HELP WITH THIS QUESTION!

Bad White [126]

Answer:

Step-by-step explanation:

Given the quadratic

d = - 16t² + 12t ← subtract d from both sides

- 16t² + 12t - d = 0 ← in standard form

with a = - 16, b = 12, c = - d

Use the quadratic formula to solve for t

t = ( - 12 ± $\sqrt{12^2-(4(-16)(-d))}$ ) / - 32

= ( - 12 ± $\sqrt{144-64d}$ ) / - 32

= ( - 12 ± $\sqrt{16(9-4d)}$ ) / - 32

= ( - 12 ± 4 $\sqrt{9-4d}$ ) / - 32

= $\frac{-12}{-32}$ ± $\frac{4}{-32}$ $\sqrt{9-4d}$

= $\frac{3}{8}$ ± $\frac{1}{8}$ $\sqrt{9-4d}$

= $\frac{3}{8}$ ± $\frac{\sqrt{9-4d} }{8}$ → D

8 0

3 years ago