Solve the problem.A rain gutter is made from sheets of aluminum that are 18 inches wide by turning up the edges to form right angles. Determine the depth of the gutter that will maximize its cross-sectional area and allow the greatest amount of water to flow.
A. 4.5 inches
B. 5.5 inches
C. 4 inches
D. 5 inches
Answer: A
Mathematics
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Find the surface area of the surface S.S is the portion of the surface 12x + 5z = 3 that lies above the rectangle 1 ? x ? 3 and 
in the 
A. 
B. 
C. 
D. 104
Mathematics
Solve the problem.The polynomial function 
represents the yearly income (or loss) from a real estate investment, where t is time in years. After how many years does income begin to decline?
A. 9.33 yr B. 7 yr C. 6 yr D. 14 yr
Mathematics
Solve the equation.x2 = 4x
A. x = 0, x = -4 B. x = 4 C. x = 0, x = 4 D. x = -4
Mathematics
Solve the problem.Find the amount of money in an account after 10 years if $2100 is deposited at 4% annual interest compounded annually.
A. $3120.49 B. $3108.51 C. $3130.75 D. $3126.61
Mathematics