Evaluate the expression with the given replacement values.-7x3y; x = 2 and y = -2
A. 112
B. 56
C. 84
D. -112
Answer: A
Mathematics
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Sketch D and g(D) from the description of D and change of variables 
x = u cos v, y = u sin v where D is the rectangle 1 ? u ? 2, 0 ? v ? 
?
A.
 ? |  |
B.
 ? |  |
C.
 ? |  |
D.
 ? |  |
Mathematics
Multiply or divide as indicated. Write the answer in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Multiply.
A. 262,720 B. 252,720 C. 253,720 D. 251,720
Mathematics
Solve the system by the substitution method.
?
?
A. 
B. 
C. 
D. 
E. inconsistent
Mathematics