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 4.2 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) = 8.4?t2
B. (A ? r)(t) = 17.64?t2
C. (A ? r)(t) = 17.64?2t
D. (A ? r)(t) = 4.2?t2
Answer: B
Mathematics
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Solve the problem.Use the rule of 70 to estimate the annual inflation rate (to the nearest tenth of a percent) that would cause the general level of prices to double in 27 years.
A. 3% B. 2.6% C. 2.9% D. 2.4%
Mathematics
Find the measure of the missing angle(s).
A. x = 65° y = 115° B. x = 115° y = 65° C. x = 125°y = 55° D. x = 25° y = 155°
Mathematics
Combine like terms.7m2 + 12m - 13m2 + 13m
A. -6m2 + 25m B. -6m2 - 25m C. 6m2 - 25m D. 6m2 + 25m
Mathematics
Six points are plotted in the figure. List all the ordered pairs needed to represent the points.
What will be an ideal response?
Mathematics