What is the answer to number 7 and 8

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

(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)