F(x)=x-4
f(3)=3-4=-1
(x-4)=3
x=7
3(f(x))=3(x-4)
3(f(3))=3(3-4)=-3
f(x)=7
Replace f(x) with f(3)
f(3) = -3x - 2
This means that you replace any x values with 3
f(3) = -3(3) - 2
Now solve. Multiply first then subtract
f(3) = -9 - 2
(f3) = -11
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Let angle HAC = A, then
cos A = 24/25 = 0.96
A = cos^-1(0.96) = 16.26