10% off 10.30 dollars

1.03

Step-by-step explanation:

Solution: 10% off 10.30 is equal to (10 x 10) / 100 = 1.03. So if you buy an item at $10.30 with 10% discounts, you will pay $9.27 and get 1.03 cashback rewards

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step-by-step explanation:

9-15%

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