Solve the application involving finding the equation of a line.If Marco hired a plumber for 5 hours the total cost would be $280. If he hired the same plumber for 12 hours , the total cost would be $630. Assume a linear relationship between the cost, y, in dollars and the number of hours worked, x. Find an equation in slope-intercept form that models the relationship between the cost and the number of hours worked.
A. y = 50x + 60
B. y = 50x + 30
C. y = 35x + 30
D. y = 50x + 30x
Answer: B
Mathematics
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A. -1, 0, 1 B. -1, 0 C. 0, 1 D. -1, 1
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Factor completely.-80y3 - 92y2 - 24y
A. -4(4y2 + 3)(5y + 2) B. y(-16y - 12)(5y + 2) C. y(4y + 3)(-20y - 8) D. -4y(4y + 3)(5y + 2)
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Find the unknown length in the right triangle. Simplify the answer if necessary. 
feet
feet
A. 8
ft
B. 2
ft
C. 10 ft
D. 20
ft
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Convert the number in the sentence to standard notation.The total paid circulation of a certain gardening magazine is $647.2 million.
A. $647,200,000,000 B. $6,472,000,000 C. $647,200,000 D. $64,720,000
Mathematics