The question is on the screenshot

answer is red (C=15+0.2x)

Step-by-step explanation:

No matter how long your airtime usage is, it will at least cost $15 per month and you have to pay $0.20 per minute/s.

Formula would be (C=15+0.2x)

An example, if she uses 5 minutes of airtime then the equation will be;

C=15+(0.2×5)

C=15+1

C=16

true statements:

a) x + y = y + x   ⇒ commutative property of addition

b) (x * y) * z = x * (y * z) ⇒ associative property of multiplication

d) (x + y) + z = x + (y + z) ⇒ associative property of addition

false statements:

c) x - y = y - x   should be: x - y = - y + x

e) (x - y) - z = x - (y - z) should be: (x - y) - z = x - (y + z)

step-by-step explanation:

1.8 or