Find the sum of the areas under the standard normal curve to the left of z=1.25 and to the rightof z=1.25

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the areas under the standard normal curve to the left of z=1.25 and to the rightof z=1.25 add up to 1.00. No calculations necessary.

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:

the most boring ever written

step-by-step explanation:

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