What’s the sum(2r-6)+4(r-3

=6r−18

Step-by-step explanation:

Distribute:

=2r+−6+(4)(r)+(4)(−3)

=2r+−6+4r+−12

Combine Like Terms:

=2r+−6+4r+−12

=(2r+4r)+(−6+−12)

=6r+−18

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6