Solve.y varies directly as x. If y = 35 when x = 5, find y when x = 9.
A. 25
B. 81
C. 49
D. 63
Answer: D
Mathematics
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Provide an appropriate response.For the joint-cost function c = 5xy(x + y)2 + 8000 (in $), determine the marginal costs 
and 
when 
and y = 5.
What will be an ideal response?
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Find the domain of the rational function.f(x) = 
A. 
B. 
C. 
D. 
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Simplify.
A. 
B. 
C. 
D. 
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Simplify using the rules for exponents.(r4s)2(r3s5)5
A. r259s3127 B. r23s27 C. r27s23 D. rs27
Mathematics