If a and y are integers and (15^a + 15^(a+1))/4^y = 15^y what is the value of a?	Choose the correct choice:	A) 2	B) 3	C) 4	D) 5	E) Cannot be determined
\frac{15^a( 1+ 15)}{4^y} = 15^y   (15^a . 4^2 ) / 4^y = 15^y. 4^0   15^a . 4^(2-y) = 15^y. 4^0   Equating the powers, a = y; 2-y = 0; So a = y = 2=2
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If a and y are integers and (15^a + 15^(a+1))/4^y = 15^y what is the value of a?