Factor the four-term polynomial by grouping.10a3 + 8a2b - 25ab2 - 20b3
A. (10a2 - 5b2)(a + 4b)
B. (2a2 - 5b)(5a + 4b)
C. (2a2 - 5b2)(5a + 4b)
D. (2a2 + 5b2)(5a - 4b)
Answer: C
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Solve the problem.The area of a circle with radius r is given by the function A(r) = ?r2. Find the area of the base of a circular storage tank if the radius is 5 feet long. Use ? ? 3.14.
A. 78.5 square feet B. 15.7 square feet C. 31.4 square feet D. 75 square feet
Make the following conversion in the metric system.0.38 kilometers to centimeters
A. 38,000 cm B. 3.8 cm C. 380 cm D. 3800 cm
Solve the formula for the specified variable.V = 
Bh for B
A. B = 
B. B = 
C. B = 
D. B = 
Use front-end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer. Finally, find the exact answer.estimate exact
A. Estimate: 12.7; exact: 12.7511 B. Estimate: 12.6; exact: 12.6511 C. Estimate: 12.6; exact: 12.7415 D. Estimate: 12.7; exact: 12.7415