Evaluate the radical function. If the function value is not a real number, state so.If f(x) = 
, find f(13).
A. not a real number
B. 25
C. 26
D. 5
Answer: D
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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 
style="vertical-align: -4.0px;" /> at 
Round your answer to the nearest pound of force?
A. 13,582 lb
B. 14,284 lb
C. 13,714 lb
D. 13,746 lb
Find the difference and simplify the answer. 
- 
A. 
B. 1
C. 16
D. 
Use the quadratic formula to solve the equation. (All solutions are real numbers.)4n2 = -12n - 3
A. 
B. 
C. 
D. 
Graph the solution set of the system of inequalities. x + y ? 45x - 2y ? -10
A. 
B. 
C. 
D. 