im doing a review for my class I've blurred my name but im struggling getting to understand some of these

The triangles are similar. what is the value of x? show your work.

(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)

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.