Solve the problem.A rock is dropped into a lake causing a circular wave to form and move away from the point where the rock hit the water. At time t, in seconds after the rock hit the water, the radius of the circle is given by 
Let A(r) = ?r2 represent the area of a circle of radius r. Interpret 
A. (r?A)(t) gives the radius as a function of the area.
B. (r?A)(t) gives no useful information.
C. (r?A)(t) gives the area as a function of radius.
D. (r?A)(t) gives the area as a function of time.
Answer: B
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Calculate the area of the surface S.S is the portion of the plane 8x + 8y + 8z = 2 that lies within the cylinder 
.
A. 18
?
B. 9
?
C. 
?
D. 9
Provide the proper response.Discuss the graph of the equation 
+ 
= 1 if a = b.
What will be an ideal response?
Use the standard normal curve table to find the closest z-score for the given condition.74.9% of the total area is to the left of z.
A. -0.67 B. 0.68 C. 0.67 D. 0.66
Determine which value(s), if any, must be excluded from the domain of the variable in the expression.
A. x = -7 B. x = 7 C. none D. x = 0