The party store has a special on greetings cards. it charges $14 for 4 greeting cards and $1.50 for each additional card. write an equation for the total cost of greeting cards in terms of the number of cards. define your variables. what is the total cost of 9 greeting cards?

C=14 +1.5(x-4)

 c= total cost

x = number of cards

cost for 9 cards:

x=9

c=14+1.5(9-4)

14+1.5(5) = 21.50

 total cost = $21.50

ok

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: