Write an equation to describe the variation. Use k for the constant of proportionality.s varies directly as y7
A. y = ks7
B. y = 
C. s = ky7
D. s = 
Answer: C
Mathematics
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Perform the indicated operation without the use of a calculator and express each answer in scientific notation.
A. 5 × 1011 B. 5 × 10-3 C. 5 × 10-11 D. 5 × 103
Mathematics
Perform the indicated division.
A. x2 + 8x + 56
B. x2 + 15x + 56
C. x3 + 8 - 
D. x2 + 15x + 8 - 
Mathematics
Perform the indicated operation.- 
÷ 
A. - 
B. 
C. - 
D. - 
Mathematics
Solve the problem.The polynomial 
gives the predicted sales volume of a company, in millions of items, where x is the number of years from now. Determine the predicted sales 15 years from now. Round your answer to two decimals, if necessary.
A. 171.54 million B. 198.18 million C. 284.27 million D. 250.79 million
Mathematics