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 5 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) = 25?t2
B. (A ? r)(t) = 25?2t
C. (A ? r)(t) = 10?t2
D. (A ? r)(t) = 5?t2
Answer: A
Mathematics
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Find the y-intercept.f(x) = 2x2 + 12x + 5
A. 
and 
B. 
and 
C. 5
D. -5
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Factor, if possible.216x12 + 125y9
A. (6x4 + 5y3)(36x8 - 30x4y3 + 25y6) B. (6x4 + 5y3)(36x8 + 30x4y3 + 25y6) C. (6x4 - 5y3)(6x4 + 5y3) D. (6x4 - 5y3)(36x2 + 30x4y3 + 25y6b2)
Mathematics
Solve the inequality and give the solution in interval notation.
? 0
A. [-12, 1) ? (1, 10] B. [-12, 1) ? [10, ?) C. (-?, -12] ? (1, 10] D. (-?, -12] ? [10, ?)
Mathematics
Graph the function using a window that gives a complete graph. What does y approach as x gets large?
?
?
A. 0 B. -10 C. 1 D. 10 E. 5
Mathematics