Evaluate.i31
A. i
B. 1
C. -1
D. -i
Answer: D
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Solve the problem.The electric current (in A) in a certain circuit as a function of time (in s) is i = 4 + 7t. What total charge passes a point in the circuit in 9 s?
A. 603 C B. 67 C C. 287.5 C D. 319.5 C
Make an approximate conversion as indicated. Round to the nearest tenth. The precise value of your approximation will depend on the conversion path that you choose.24 L = 
pt
A. 50.7 B. 57.6 C. 21.8 D. 22.7
Find the exact value of the expression.
A. - 
B. -2
C. - 
D. -
Answer the question.The following table gives the electricity usage (in kilowatt hours) for the Peters family for six months.
What is the average electricity usage for the months January through April?
A. 988.54 kwh B. 977.55 kwh C. 983.56 kwh D. 975.251 kwh