Solve the problem.A stone is thrown into a pond. A circular ripple is spreading over the pond in such a way that the radius is increasing at the rate of 4 feet per second. Find a function, r(t), for the radius in terms of t. Find a function, A(r), for the area of the ripple in terms of r. 
A. (A ? r)(t) = 16?t2
B. (A ? r)(t) = 16?2t
C. (A ? r)(t) = 4?t2
D. (A ? r)(t) = 8?t2
Answer: A
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Find the equation for the tangent to the curve at the given point.f(x) = 
; 
A. y = 
x + 
B. y = 13x - 16
C. y = - 
x + 
D. y = -39x - 80
Fill in the blank with one of the words or phrases listed below.
The 9 above is called the 
.
A. subtrahend B. addend C. minuend D. difference
Solve the linear equation with the intersection-of-graphs method. Approximate the solution to the nearest hundredth if necessary.-6.2(x + 7.1) = -9.8(7.4 - 7x) + 20.9
A. -0.12 B. 0.1 C. 0.66 D. 1.28
Perform row operations on the augmented matrix as far as necessary to determine whether the system is independent, dependent, or inconsistent. x + y + z = -4 x - y + 2z = -64x + 4y + 4z = -13
A. Independent B. Dependent C. Inconsistent