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: C
Mathematics
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Use an algebraic approach to solve the problem:A board 20 feet long is cut into two pieces such that the length of one piece is two-thirds of the length of the other piece. Find the length of the shorter piece of board.
A. 20 feet B. 4 feet C. 12 feet D. –4 feet E. 8 feet
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Solve the equation.
= 
A. 
B. 
C. 
D. 
Mathematics
Write an equation that expresses the relationship. Use k for the constant of proportionality.p varies directly as q and inversely as r.
A. p = 
B. p = 
C. pqr = k
D. p + q - r = k
Mathematics
Estimate the percentage. ? 50% of 2,210 ?
A. 1,100 B. 5,525 C. 552.5 D. 221 E. 11,050
Mathematics