Solve the problem.The position(in feet) of an object oscillating up and down at the end of a spring is given by 
at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. Find the object's velocity at time t.
A. v = A cos 
ft/sec
B. v = A
cos 
ft/sec
C. v = - A
cos 
ft/sec
D. v = A
cos 
ft/sec
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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Find the unknown value.54 is 135% of what number?
A. 182.25 B. 18,225 C. 400 D. 40
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Solve. $350 is deposited into an account with interest rate r (in decimal form), compounded annually. The amount in the account after t years is given by 
Calculate the amount in the account after 2 years if the interest rate r is 0.05. Round your answer to the nearest cent.
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Mathematics