Ms. Nichols math group earned the following grades in math for geometry: 88, 65, 60, 42 , 55, 58, 88, 90 and 85
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Step-by-step explanation:

70.11111111

Step-by-step explanation:

88+65+60+42+55+58+88+90+95=631

631/9=70.11111111

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step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: