Solve the problem.The function A described by A(r) = 4?r2 gives the surface area of a sphere with radius r. Find the area when the radius is 4 in. Round your answer to two decimal places.
A. 50.27 in.2
B. 201.06 in.2
C. 64 in.2
D. 150.8 in.2
Answer: B
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Provide an appropriate response.Explain why the following five statements ask for the same information.(a) Find the roots of f(x) = 4x3 - 2x - 5.(b) Find the x-coordinate of the points where the curve y = 4x3 crosses the line 
(c) Find all the values of x for which 4x3 - 2x = 5.(d) Find the x-coordinates of the points where the cubic curve y = 4x3 - 2x crosses the line 
(e) Solve the equation 4x3 - 2x - 5 = 0.
What will be an ideal response?
Solve the problem.Show that g(x) = 
is an increasing function of x.
What will be an ideal response?
Use the Quotient Rule to find the derivative of the function.
Solve the problem.A cross-section of an irrigation canal is a parabola. If the surface of the water is 38 feet wide and the canal is 19 feet deep at the center, how deep is it 1 feet from the edge?
A. 17.1 ft B. 1 ft C. 18 ft D. 1.9 ft