real life application of a polynomial function

Question

1) what is the domain and range of y= 2x + 5

2) pls help create a real life application on the function y=2x+5 with a detailed solution

Pls solve asap and thanks in advance

Answer 1

The domain and range of this linear function is the whole number line.

The gym membership costs $2 per month and an initial sign up fee of $5. Then the function 2x+5 gives the total cost of the membership after x months.