If (2 to the x) - (2 to the (x-2)) = 3 (2 to the 11), what is the value of x? Select.
A) 9 B) 11 C) 13 D) 15 E) 17
(2 to the power x) - (2 to the power (x-2)) = 3 (2 to the power 11)   2^x - 2^(x-2) = 3. 2^11   Hence x = 13.   Answer is 13
<result>C</result>
If (2 to the x) - (2 to the (x-2)) = 3 (2 to the 11), what is the value of x?