The sides of the rectangle are inreased by a scale factor of 4. the perimeter of the smaller retangle is 20 cm. what is the perimeter of the larger rectangle?

The height of the smaller rectangle, let us say is 5
5 x 4 = 20
(multiply height of rectangle to scale factor)
the length is 4
4 x 4 = 16
(multiply length of rectangle to scale factor)

to find larger factor, divide smaller with larger
16/20 = 1/4

scale factor should be 1/4

multiply 20 with 4

perimeter of larger should be 80

hope this helps

Iam not sure , but probably 750 or 7.5

Main idea on left, details on right