Solve the problem.The sales in thousands of a new type of product are given by S(t) = 40 - 70e-0.5t, where t represents time in years. Find the rate of change of sales at the time when t = 3.
A. -156.1 thousand per year
B. 156.1 thousand per year
C. -7.8 thousand per year
D. 7.8 thousand per year
Answer: D
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Find the determinant of the matrix  figure 1.png)
, if it exists
What will be an ideal response?
Simplify the expression. Express the answer so that all exponents are positive. Whenever an exponent is 0 or negative, we assume that the base is not 0.(-5x3)-1
A. 
B. 
C. - 
D. - 
Divide.(p2 + 2p - 59) ÷ (p + 9)
A. p - 7 + 
B. p - 4 + 
C. p + 7 + 
D. p - 7
Solve the problem.A balloon used in surgical procedures is cylindrical in shape. As it expands outward, assume that the length remains a constant 60.0 mm. Find the rate of change of surface area with respect to radius when the radius is 0
mm. The surface area is given by the formula 
where l is the length and r is the radius. (Answer can be left in terms of ?).
A. 120.0? mm2/mm B. 120.12? mm2/mm C. 60.12? mm2/mm D. 60.06? mm2/mm