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. 48 mph
B. 73 mph
C. 98 mph
D. 149 mph
Answer: B
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There are various formulas that will generate Pythagorean triples. Use the specified formula and specified values to generate a Pythagorean triple.For any integer n greater than 1, 
is a Pythagorean triple .Use this method with the value n = 13 to generate a Pythagorean triple.
A. (26, 168, 170) B. (26, 169, 338) C. (13, 25, 27) D. (13, 144, 196)
Solve the problem.A square plywood platform has a perimeter which is 10 times the length of a side, decreased by 12. Find the length of a side.
A. 8 B. 2 C. 1 D. 6
Find the derivative.f(x) = 5x4 + 2x3 - 9
A. 4x3 + 3x2 - 7 B. 4x3 + 3x2 C. 20x3 + 6x2 D. 20x3 + 6x2 - 7
Solve the inequality.x2 - 49 > 0
A. (-?, -49) or (49, ?) B. (-7, 7) C. (-49, 49) D. (-?, -7) or (7, ?)