Which expression represent his total cost?

I think its A.

Step-by-step explanation:

He's saving $1 so it would be subtracted off, and he's buying 5 muffin packs. Hope this helps.

554.4

step-by-step explanation:

44*12.6=544.4

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: