Jonas purchased a 42 months 3 1/2 year certificate of deposit and it cost $600 and pays 7% interest each year how much interest Will he get and how much will the certificate be worth when he cashes in? I know the awsner but I need to know how to do it

(05.03 mc) part a: explain why the x-coordinates of the points where the graphs of the equations y = 4x and y = 2x−2 intersect are the solutions of the equation 4x = 2x−2. (4 points) part b: make tables to find the solution to 4x = 2x−2. take the integer values of x between −3 and 3. (4 points) part c: how can you solve the equation 4x = 2x−2 graphically? (2 points)