Use the empirical rule to solve the problem. The amount of Jen's monthly phone bill is normally distributed with a mean of $78 and a standard deviation of $12. What percentage of her phone bills are between $42 and $114?

d) -1

step-by-step explanation:

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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

y=x+9

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step-by-step explanation: