Perform the indicated operations and express your answer in the form a + bi. 
A. -13
B. 13
C. 13i
D. -13i
Answer: C
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Solve the problem.A particle moves along an ellipse in the xy-plane in such a way that its position at time t is 
Find the maximum and minimum values of 
and 
. (Hint: Find the extreme values of 
2 and 
2 first and take
square roots later).
A. 
min = 5; 
max = 8; 
min = 45; 
max = 72
B. 
min = 15; 
max = 24; 
min = 15; 
max = 24
C. 
min = 15; 
max = 24; 
min = 45; 
max = 72
D. 
min = 
max = 24; 
min = 
max = 72
Use the given transformation to evaluate the integral.
Rwhere R is the interior of the ellipsoid 
A. 
?
B. 
?
C. 
?
D. 
?
Write a numerical expression for the phrase and simplify it.3 added to the sum of -6 and 10
A. 3 + 6 + 10; 19 B. 3 + 10 - 6; 13 C. -3 - 6 - 10; -19 D. 3 + [(-6) + 10]; 7
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 May?
A. 936.8 kwh B. 957.86 kwh C. 958.97 kwh D. 971.23 kwh