What is (g ° f)(2) for f(x) = 10 /x - 1 and g(x) = 7x – 4?

G of f means plug f(x) into g(x)

but we want at x=2 

we can solve to ways

1) find g(2)=7x-4
= 10

f(10)= 10 / (x-1)
answer is 10/ 9

method 2 is 

(f(g)x)= 10/ ((7x-4)-1)
=10/(7x-5)

now x=2 
=10/(7(2)-5)
=10/9

same answer, hope this helps

The answer to that is 6