Write the expression in standard form.
? 
A. 21
B. -21
C. 21i2
D. -21i
Answer: B
Mathematics
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Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.x = 32 - y2, x = y2, y = 0
A. 128? B. 256? C. 512? D. 64?
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Evaluate the surface integral of G over the surface S.S is the dome z = 5 - 10x2 - 10y2, z ? 0; G(x, y, z) = 
A. 50
B. 
?
C. 5?
D. 50?
Mathematics
Find the average value of the function f over the region R.f(x, y) = sin 
(x + y)R: 0 ? x ? 
, 0 ? y ? 
A. 
B. ?2
C. 
D. 4?2
Mathematics
Solve.Susan charges $160 plus $40 an hour to clean houses. If a client's total bill were $280, how many hours did Susan spend cleaning the client's house?
A. 3 hours B. 4 hours C. 120 hours D. 7 hours
Mathematics