Help me with 1 and 2

Select all the correct statements. the amount in dollars an electrician charges in terms of the number of hours worked is represented by the function y = 22x + 42. from the function, identify all the phrases that hold true for the situation. the electrician charges an initial fee of $22 the y-variable represents the number of hours the electrician charges an initial fee of $42 the electrician charges $22 for every hour worked the x-variable represents the electricians charges in dollars the electrician charges $42 for every hour worked

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

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.