What could represent the total cost

d

Step-by-step explanation:

vertical axis = total cost, horizontal axis = number of cd

it would start higher on the vertical axis as the starting cost is higher (7000 vs 5000), but the line would be less steep as the increase in cost between cds is less.

means if you're already damaged some way when you take out a medical insurance you will not get full compensation for that injury that you already have.

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: