Solve the problem.y varies jointly as a and b and inversely as the square root of c. y = 10 when a = 4, b = 5, and Find y when a = 9, b = 9, and c = 25.

A. 12.96
B. 1620
C. 16.2
D. 64.8

Answer: D

Mathematics

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You start making regular deposits to your piggy bank. The amount P, in dollars, in your piggy bank after t weeks is given by

?
.
The price of the computer you want to buy is decreasing.  The price C, in dollars, t weeks after you started saving money is given by
.
?
When will there be enough money in your piggy bank to buy the computer? Report your answer as a whole number.
?

A. After 8 weeks
B. After 7 weeks
C. After 10  weeks
D. There will never be enough.