The 9th graders are selling tickets to raise
money for a class field trip. They are selling
student tickets for $5 and adult tickets for
$9. The 9th graders received a total of
$240 from sales. In total, 40 tickets were
sold.

their is no graph showing

step-by-step explanation:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15