Which of the following is a proportion?

a) 3/4=12/15
b)8/10=6/8
c)6/9=8/12
d)4/6=9/12

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

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo