Evaluate the sum.
?
Fill in the blank(s) with the appropriate word(s).
99
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The following chart shows some figures from an income statement. Prepare a vertical analysis by expressing each item as a percent of net sales. Round percents to the nearest tenth of a percent. 
A. 59.8%, 17.8%, 44.4%, 15.0% B. 59.8%, 18.1%, 13.2%, 25.1% C. 59.8%, 17.8%, 7.9%, 15.0% D. 59.8%, 29.7%, 13.2%, 25.1%
Write the system of linear equations represented by the augmented matrix. Use x, y, z, and, if necessary, w for the variables. Then use back-substitution to find the solution.
A. {(0, 
, -5)}
B. {(
, 14, -4)}
C. {(
, 8, -4)}
D. {(- 
, 14, -4)}
Divide.3.457 ÷ 0.001
A. 0.0003457 B. 345.7 C. 3457 D. 0.003457
Solve the problem.Suppose that the labor cost for a building is approximated by 
where x is the number of days of skilled labor and y is the number of days of semiskilled labor required. Find the x and y that minimize cost C.
A. x = 30, y = 36 B. x = 70, y = 24 C. x = 35, y = 12 D. x = 12, y = 30