Estimate the sum or difference by first rounding to the nearest ten.87
A. 100
B. 73
C. 80
D. 70
Answer: C
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Find the LCD of the given fractions by prime factorization.
and 
A. 168 B. 224 C. 1344 D. 672
Solve.Suppose that an estimated 8750 gigatons of mass of a certain ice sheet has been lost since the beginning of the 20th century. Given that a gigaton is 1012 metric tons, and a metric ton is 1000 kilograms, convert this loss to U.S. customary tons. Express your answer in scientific notation to three decimal places.
A. 8.750 × 1015 tons B. 8.750 × 1012 tons C. 9.645 × 1012 tons D. 9.645 × 1015 tons
Solve. Use ? ? 3.14 and round to the nearest tenth.A bicycle wheel makes 2 revolutions. The diameter of the wheel is 17 inches. Determine how far the bicycle travels in inches.
A. 34 in. B. 53.4 in. C. 106.8 in. D. 213.5 in.
Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.7x = 6x + 7
A. 40.68 B. 81.36 C. 42.00 D. 3.36