2mn +4n2 and 5m2 - 7mn
5 m2 + 5 mn - 4 12
5 m2 - 14 mn - 4 12
9 12 + 9 mn-4 17
5 m2-5 mn + 4 12

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

answer: 12,000

step-by-step explanation: first you ar e supposed to add. then multiply then subtract