Solve the problem.Suppose that for an electrical appliance, voltage is given by 
and amperage by 
where t is time in seconds. The wattage is given by 
Find the maximum wattage used by the appliance.
A. 404.46
B. 101.115
C. 189
D. 202.23
Answer: D
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Write the fraction or mixed number as a decimal. Round to the nearest thousandth if necessary.
A. 0.3 B. 0.45 C. 0.4 D. 0.5
Write the system of equations associated with the augmented matrix. Do not solve.
A. 
B. 
C. 
D. 
Select the graph of the function.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Suppose the average costs of a mining operation depend on the number of machines used, and average costs, in dollars, are given by 
,
, wherexis the number of machines used. How many machines give minimum average costs?
?
A. Using 25 machines gives the minimum average costs. B. Using zero machines gives the minimum average costs. C. Using 35 machines gives the minimum average costs. D. Using 50 machines gives the minimum average costs. E. Using 55 machines gives the minimum average costs.