9. What is the number described below? 2.75 more than 3 times a number is 13 1\4 a.3 b.3 6\11 c. 4 4\7 D. 56

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

21/58.

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but which class are u may know that first