Solve the problem.The formula v = 
can be used to estimate the maximum safe velocity v, in miles per hour, at which a car can travel along a curved road with a radius of curvature r, in feet. To the nearest whole number, find the maximum safe speed for a curve in a road with a radius of curvature of 400 feet.
A. 13 mph
B. 20 mph
C. 50 mph
D. 32 mph
Answer: D
Mathematics
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Find the requested number.Two-thirds of a number is -8. What is the number?
A. -24 B. 24 C. -12 D. 12
Mathematics
Write the number as a product of a real number and i. Simplify the radical expression.- 
A. 3i
B. 3
C. -3i
D. -3
Mathematics
Multiply the monomials.-4x9y2 ? 10x4y
A. 6x36y2 B. -40x13y3 C. 6x13y3 D. -40x13y2
Mathematics
The given pattern continues. Write down the nth term of the sequence suggested by the pattern.
, - 
, 
, - 
A. an = 
B. an = 
C. an = 
D. an = 
Mathematics