Which equation below is a true statement about △abc? a. x = b-acosc b. cosc = h/a c. h = acosc d. cosc = h/b

We know that
in the right triangle BDC
cos C=(b-x)/a---> a*cos C=b-x> x=b-a*cos C
sin C=h/a> h=a*sin C

therefore

the answer is 
A.) x = b-acosC

It will be a whole number.