I'm on to the next section of my book and i'm trying to figure out these from the HW, can't get any of the answers listed.

1) √(x(x-7))

A) √(x(x-7)(2x-7))

B) [(lnx+lnx(x-7))/2]

C) (1/2)((1/x) + 1/(x-7))

D) (√(x(x-7))/2)(1/x + 1/(x-7))

2) y=√(x/(x-5))

A) (1/2)(lnx-ln(x-5))

B) (1/2)√(X/(x-5))(1/x - 1/x(x-5))

C) (1/2)(1/x - 1/(x-5))

D) -5/2√(x/(x-5))

3) y=xsinx/√(x+2)

Thanks for any help!