An object is attached to a coiled spring. The object is pulled down (negative direction from the rest position) and then released. Write an equation for the distance of the object from its rest position after t seconds.amplitude = 8 cm; period = 4 seconds
A. d = -8 cos 
?t
B. d = -8 sin 
?t
C. d = -8 cos 
t
D. d = -4 cos 
?t
Answer: A
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Compare the right-hand and left-hand derivatives to determine whether or not the function is differentiable at the point whose coordinates are given.
y = 
y = -1
A. Since limx?-1+ f '(x) = 0 while limx?-1- f '(x) = 1, f(x) is not differentiable at 
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A. Yes B. No