Six times a number added to 8 amounts to -13 added to the product of 3 and the number

At his new job, jeremiah can choose an hourly rate of $9 plus a $50 weekly bonus for opening the store, or an hourly rate of $10 per hour with no opening bonus. the equations model his salary options. y = 9x + 50 y = 10x

What is the inverse of the function f(x)=4x+8

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)