Finding surface area of the composite figure​

20 points for the answer. this is for real , don't put random ! a rectangle has a length of 4 centimeters and a width of 7 centimeters. what is the effect on the perimeter when the dimensions are multiplied by 5? the perimeter is increased by a factor of 5. the perimeter is increased by a factor of 20. the perimeter is increased by a factor of 25. the perimeter is increased by a factor of 100.

Solve the system of equations. y=3x-1 and y=-2x+9. show work

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )