In a large population of high school students, the mean IQ is 112 with a standard deviation of 20. What is the probability of selecting 10 high school students that have an average IQ score of 114.5 or more?

a) what number, when added to negative four, is equal to negative five?

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:

answer: 819.89 miles across america

step-by-step explanation: