Solve the problem.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 30 gallons of fuel. Find the number of gallons of fuel that the helicopter uses to fly for 6 hours.
A. 60 gallons
B. 66 gallons
C. 70 gallons
D. 18 gallons
Answer: A
Mathematics
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Solve the problem.Find the length of the curve x = 
- 4 ln 
, 8 ? y ? 16.
A. 6 + 4 ln 2
B. 8 + 4 ln 2
C. 6 + 4 ln 
D. 8 + 4 ln 
Mathematics
Use Cramer's rule to solve the linear system. If D = 0, use another method to determine the solution set.6x + 9y = 18-3x + 7y = -9
A. {(2, 1)} B. {(3, 1)} C. {(3, 0)} D. Cramer's rule does not apply since D = 0; ?
Mathematics
Decide whether or not the set of ordered pairs defines a function.{(-6, -9), (-6, -4), (1, 4), (6, -4), (8, -1)}
A. No B. Yes
Mathematics
Find the range of the quadratic function.f(x) = -x2 + 10x + 3
A. [28, ?) B. (-?, 5] C. (-?, 28] D. [5, ?)
Mathematics