Solve the problem.The cost (in dollars) of manufacturing x items is given by: C(x) = x3 - 7x2 + 15xWhat is the cost of manufacturing 11 items?
A. $699
B. $659
C. $654
D. $649
Answer: D
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A piece of machinery valued at $38,000 depreciates at a rate of 7% yearly. How long will it take until it has a value of $19,000? Please round the answer to the nearest tenth.
A. 11.9 years B. 14.9 years C. 12.9 years D. 9.9 years E. 8.9 years
Is the following correspondence a function??
A. Yes B. No
Solve the problem.Linda invests src="https://sciemce.com/media/4/ppg__tttt0516191133__f1q124g6.jpg" alt="" style="vertical-align: -4.0px;" /> and 
for one year. Part is invested at 
, another part at 
, and the rest at 
. The total income from all 3 investments is 
. The combined income from the 
investments is the same as the income from the 
investment. Find the amount invested at each rate.
A. $10,000 at 5%; $5000 at 6%; $10,000 at 8%
B. $8000 at 5%; $10,000 at 6%; $7000 at 8%
C. $5000 at 5%; $10,000 at 6%; $10,000 at 8%
D. $10,000 at 5%; $10,000 at 6%; $5000 at 8%
The function f is one-to-one. Find its inverse.f(x) = 
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 
D. f-1(x) = 