3. which sum does the number line
represent?
-11 + (-9)
-11 + 9
-11 + (-2)
-11 + (2)

The sum that represents the number line is: -11 + 9

angle addition postulate

2x=56

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