Factor by grouping.12a3 - 9a2b - 20ab2 + 15b3
A. (3a2 - 5b)(4a - 3b)
B. (3a2 + 5b2)(4a + 3b)
C. (3a2 - 5b2)(4a - 3b)
D. (12a2 - 5b2)(a - 3b)
Answer: C
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Solve the problem.A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 26 feet. If the distance across the top of the mirror is 56 inches, how deep is the mirror in the center?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Convert using dimensional analysis.67 years to minutes (assume 365.25 days in a year)
A. 96,480 min. B. 35,239,320 min. C. 35,215,200 min. D. 19,296 min.
Perform the indicated operation.
Fill in the blank(s) with the appropriate word(s).
Solve.Sammy received a birthday check for $40.00 from his grandmother. He immediately cashed the check and went on a shopping spree. In three different stores he spent $13.44, $10.85, and $6.48, respectively. How much was left of the birthday money after these purchases?
A. $30.77 B. $10.23 C. $9.23 D. $9.53