Solve the problem.When going more than 38 miles per hour, the gas mileage of a certain car fits the model 
where x is the speed of the car in miles per hour and y is the miles per gallon of gasoline. Based on this model, at what speed will the car average 15 miles per gallon? (Round to nearest whole number.)
A. 98 mph
B. 48 mph
C. 149 mph
D. 73 mph
Answer: D
Mathematics
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Factor the expression.
A. 
B. 
C. 
D. 
E. prime
Mathematics
Find all solutions to the triangle described below.
?
m, 
m
?
Apply the rules regarding the use of significant digits to each angle and length after all computations are complete.
?
A. 
m
B. 
? m or 
m
C. 
? m
D. 
? m or 
m
E. no solution
Mathematics
Find the derivative of the function at the given value of x.f(x) = x3 + 4x; x = -2
A. 16 B. 12 C. 4 D. -2
Mathematics
Solve the problem.The child-proof cap of a medicine bottle will not function properly if the radius r of the cap is more than 59.7 millimeters or less than 59.1 millimeters. Express this as an inequality.
A. 59.1 < r < 59.7 B. 59.1 ? r ? 59.7 C. r ? 59.1 or r ? 59.7 D. r < 59.1 or r > 59.7
Mathematics