Solve.The force needed to keep a car from skidding on a curve varies jointly as the weight of the car and the square of the car's speed, and inversely as the radius of the curve. If a force of   is needed to keep an  car traveling at 20 mph from skidding on a curve of radius  what force would be required to keep the same car from skidding on a curve of radius -4.0px;" /> at  Round your answer to the nearest pound of force?



A. 31,869 pounds

B. 32,439 pounds

C. 31,737 pounds

D. 31,901 pounds

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Answer: A

Mathematics

Solve the equation.3(10 - 2x) = 81

A. {3} B. {2} C. {-3} D. {4}

Find the power of i.i19

A. -1 B. -i C. i D. 1

Solve the problem.How many different 7-letter codes are there if only the letters A, B, C, D, E, F, G, H, and I can be used and no letter can be used more than once?

A. 7 B. 4,782,969 C. 36 D. 181,440

Rewrite the system of inequalities, adding slack variables or subtracting surplus variables as needed.2x1 + 5x2 ? 6 x1 + 3x2 ? 2

A. 2x1 + 5x2 - s1 = 6  x1 + 3x2 + s2 = 2 B. 2x1 + 5x2 + s1 = 6  x1 + 3x2 + s2 = 2 C. 2x1 + 5x2 - s1 = 6  x1 + 3x2 - s2 = 2 D. 2x1 + 5x2 + s1 = 6  x1 + 3x2 - s2 = 2