Please help it has 30 points and it’s easy I just don’t pay attention I have to have the whole equation G - 9.4 = 5.2

Iam so stuck. what is the worked out answer for this question?

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.