Solve the problem.The position (in centimeters) 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 acceleration at time t.
A. a = - A sin 
cm/sec2
B. a = - A
sin 
cm/sec2
C. a = 
cos 
cm/sec2
D. a = - 
sin 
cm/sec2
Answer: D
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Simplify the complex fraction using Method 1.
A. 
B. 
C. 32
D. 
Perform the indicated operation and simplify. Write the result in the form a + bi.(4 - 4i) - (4 - i)
A. 0 - 5i B. 0 - 3i C. 8 - 5i D. 8 - 3i
Solve the equation.3x3 - 4x2 - 7x = 0
A. 
, 1
B. 
, 0
C. 
, -1, 0
D. 
, -1, 0
Use the formula for the sum of a geometric sequence to solve the problem.After a sales clerk works six months, her employer will begin an annuity for her and will contribute $550 every six months to a fund that pays 6% annual interest. After she has been employed for three years, what will be the amount of the annuity?Round your answer to the nearest cent.
A. $3,554.62 B. $3,565.25 C. $3,557.63 D. $3,487.63