Solve the problem.A boat heads upstream a distance of 30 miles on the Mississippi river, whose current is running at 5 miles per hour. If the trip back takes an hour less, what was the speed of the boat in still water? Give the answer rounded to two decimal places, if necessary.
A. 16.58 mph
B. 6 mph
C. 15 mph
D. 18.03 mph
Answer: D
Mathematics
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Solve the problem.A woman made a deposit of $215. If her deposit consisted of 83 bills, some of them one-dollar bills and the rest being five-dollar bills, how many one-dollar bills did she deposit?
A. 40 one-dollar bills B. 33 one-dollar bills C. 45 one-dollar bills D. 50 one-dollar bills
Mathematics
Solve.
= 1 + 
A. -10, 12 B. No solution C. -30, 12 D. 10, -12
Mathematics
Solve the problem.Find the exact interest on a loan of $5500 at 12% annually for 134 days.
A. $245.67 B. $240.17 C. $236.88 D. $242.30
Mathematics
Determine whether the pair of triangles is congruent by the ASA property. 
A. Yes B. No
Mathematics