Im pretty sure that the answer to that is 5-9m+n
The answer is 99x. pretend like the variable isn't even there at the beginning. Then at the end put it in next to the answer.
.44/.8=×/1
×=.55
..................................
Let angle HAC = A, then
cos A = 24/25 = 0.96
A = cos^-1(0.96) = 16.26