Solve the problem.The formula 
models the safe maximum speed, v, in miles per hour, at which a car can travel on a curved road with radius of curvature, r, in feet. A highway crew measures the radius of curvature at an exit ramp as 160 feet. What is the maximum safe speed?
A. 25 miles per hour
B. 20 miles per hour
C. 16 miles per hour
D. 17 miles per hour
Answer: B
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Solve for x using an equivalent exponential expression.The function f(x) = 300(0.5)x/50 models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 131 pounds B. 180 pounds C. 168 pounds D. 125 pounds
Use the unit circle to determine the value of the given expression or state that it is undefined.sin (24?)
A. undefined B. -1 C. 1 D. 0
Use a special product formula to simplify.(a - 6)(a + 6)
A. a2 - 36 B. a2 + 12a - 36 C. a2 - 12 D. a2 - 12a - 36
Find the domain of the rational function.f(x) = 
A. {x|x ? -2, x ? 2} B. {x|x ? 0, x ? 4} C. {x|x ? -2, x ? 2, x ? -6} D. all real numbers