Simplify the expression. Assume that all variables are positive and write your answer in radical notation.
? 
A. 
B. 
C. 
D. 
Answer: B
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Solve the problem.Under certain conditions, the cost per mile C of operating a car is a function of the speed v (in mi/h) of the car, given by C = av2 + bv + c. If C = 25.25 ¢/mi for v = 5 mi/h, C = 26 ¢/mi for v = 20 mi/h, and 
for v = 35 mi/h, find C as a function of v.
A. C = 0.2v2 + 26v + 0.01 B. C = 0.01v2 -0.2v + 26 C. C = 26v2 - 0.01v + 0.2 D. C = 0.01v2 + 26v + 0.2
Solve the proportion equation.
= 
A. 28.05 B. 18.7 C. 10.15 D. 37.3
Solve the problem.Any offset between a stationary radar gun and a moving target creates a "cosine effect" that reduces the radar mileage reading by the cosine of the angle between the gun and the vehicle. That is, the radar speed reading is the product of the actual reading and the cosine of the angle. Find the radar reading to the nearest hundredth for the auto shown in the figure. 
A. 30.82 mph B. 80.29 mph C. 86.93 mph D. 85.07 mph
Write the standard form of the equation of the circle.Center (5, 7), r = 12
A. (x + 5)2 + (y + 7)2 = 12 B. (x - 5)2 + (y - 7)2 = 144 C. (x + 5)2 + (y + 7)2 = 144 D. (x - 5)2 + (y - 7)2 = 12