If the ratio of children to adults is 5:7 and there are 100 children at an arts festival, how many adults are in attendance?

140 adults.

Step-by-step explanation:

5:7 Ratio. 100 Children, so if we want the adults we want to reverse the ratio, 100 x 7/5 = 140.  

140 Adults.

To check our work we can see if the fractions are the same, so divide 5/7 and 100/140 and you'll see they both have the same result.

lo.lll

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