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x = 12/5

Step-by-step explanation:

Since the original is 10 and the second is 6, that means that the scale is 10:6 or 5:3.  It can also be related as %60 of the length.

Step 1:  Make an equation

10/6 = 4/x

Step 2:  Cross Multiply

10x = 24

Step 3:  Divide

10x / 10 = 24 / 10

24/10 = 12/5

x = 2.4

b

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3

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7

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14

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6

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3

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7

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14

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step-by-step explanation:

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