Ms. Simpson gives her class the following problem:Simplify: 3 (x-2) + 6x. Mikey
simplifies the problem: 3x - 6 + 6x = 15x. What did Mikey do wrong?

first off, when did Marge become a teacher

Step-by-step explanation:

Second off, he didn't flip the sign inside of the parentheses.

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:

step-by-step explanation:

the true ones are a b and d