5xy + 20x + 7y + 28
A. (5x + y)(7y + 4)
B. (5x + 4)(y + 7)
C. (5x + 7y)(y + 4)
D. (5x + 7)(y + 4)
Answer: D
Mathematics
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Find the exact value for the expression.cot 
A. - 
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Solve the problem.The rate of expenditure of a particular machine is given by 
where x is time measured in years. Maintenance costs through the second year are $88. Find the total maintenance function.
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