Solve the problem.A certain radioactive isotope decays at a rate of 2% per 200 years. If t represents time in years and y represents the amount of the isotope left, use the condition that 
to find the value of k in the equation 
A. -0.02020
B. 0.00010
C. 0.01332
D. -0.00010
Answer: D
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Multiply.(6.5)(1000)
A. 6500 B. 65,000 C. 6.500000 D. 0.0065
Solve the problem.A share of stock loses 21% in value and then gains 21% . How does its ending value compare with its initial value?
A. More B. The same C. Less
Solve.A circular fountain has a statue in its center, 3 m from the edge. What is the distance around the fountain? Round results to the nearest tenth of a unit.
A. 18.8 m B. 9.0 m C. 16.8 m D. 9.4 m
Solve the problem.An oil well off the Gulf Coast is leaking, with the leak spreading oil over the surface of the gulf as a circle. At any time t, in minutes, after the beginning of the leak, the radius of the oil slick on the surface is 
Find the area A of the oil slick as a function of time.
A. A(r(t)) = 9t2 B. A(r(t)) = 9?t C. A(r(t)) = 3?t2 D. A(r(t)) = 9?t2