Solve.The amount of gas that a helicopter uses is directly proportional to the number of hours spent flying. The helicopter flies for 3 hours and uses 15 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 4 hours.
A. 24 gallons
B. 12 gallons
C. 20 gallons
D. 25 gallons
Answer: C
Mathematics
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Find the arithmetic mean 
, of the following set of data.15, 20, 25, 30, 35
A. 30 B. 20 C. 25 D. 125
Mathematics
Add or subtract. Express the answer as a mixed number.-6
+ 15
A. 8
B. 9
C. 8
D. 7
Mathematics
Solve the problem.A rectangular enclosure must have an area of at least 1200 yd2. If 160 yd of fencing is to be used, and the width cannot exceed the length, within what limits must the width of the enclosure lie?
A. 20 ? w ? 40 (yards) B. 40 ? w ? 60 (yards) C. 0 ? w ? 20 (yards) D. 20 ? w ? 60 (yards)
Mathematics
Solve the problem. Round your answer to the nearest tenth, if necessary.Last year, Maria earned $369 per week. This year, her salary increased to 
per week. What is the percent of increase?
A.
| 91.3% |
B.
| 8.7% |
C. 9.5%
D.
| 90.5% |
Mathematics