Julio bought several books from the coming-around-again bookstore. he paid $31.80, including 6% sales tax. he then discovered that he should have been charged $2.50 instead of $4.00 for one of the books. how much should julio have been charged, including tax? a. 30.06 b.30.21 c.30.30 d.30.45

i you goofed up when writing this, because hnot is not a word minusf is not either. i cannot answer   because of that.

step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10