If log_2 (5) = x and log_2 (3) = y , determine an expression for log_2 (15/2), in terms of x and y.
A. xy
B. x + y
C. xy - 1
D. x + y - 1
I'm suppose to solve this by hand but it doesn't seem possible. I tried so many ways but the does not come out as D. which is the answer Can someone...