Actually, DIEDERICK drove faster than BROOK. What you can do to find out the answer, is divide. Brook drove 180 miles in 3 hours, so divide 180 by 3, and you get 60. If you divide 160 by 4, you get 40. So, that means that Diederick drove faster than Brook.
$42.
50% of 84 is the same as 84/2, which is 42.
Correct Answer: Option DPrincipal Amount = P = $8,470
Interest rate = r = 12% = 0.12
Time = t = 2
Number of compounding periods in a year = n = 12
Compounded amount = A = ?
Formula for compound interest is:

Usingthe values in the formula, we get:
Therefore, option D is the correct answer.
It's the first answer
hope this helps