Factor the four-term polynomial by grouping.15a3 - 12a2b + 20ab2 - 16b3
A. (3a2 + 4b2)(5a - 4b)
B. (3a2 - 4b2)(5a + 4b)
C. (3a2 + 4b)(5a - 4b)
D. (15a2 + 4b2)(a - 4b)
Answer: A
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The annual rate, r, compounded annually, it takes for 1 dollar to grow to D dollars in 3 years is given by the formula 
. Find the rate necessary for a dollar to double in 3 years.
?
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