2. 3 times the sum of a number x and 13

(x+13)2.3                 if simplifying.    

Step-by-step explanation:

sum means add. so x plus 13  times 2.3     or    2.3(x+13)

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