Which of the following is equal to 3^k*5^(k-1)?  Choose one:
A) 3*15^(k-1)
B) 5*10^(k-1)
C) 15^k
D) 3*15^k
E) 15^(2k-1)
3^k*5^(k-1) = 3*3^(k-1)*5^(k-1) = 3*15^(k-1)   The answer is 3*15^(k-1).
<result>A</result>
Which of the following is equal to 3^k*5^(k-1)?