First, we can do distributive property.
-3(n + 8) = 15
-3 x n = -3n, -3 x 8 = -24
So we have, -3n + -24 = 15
Minus -24 on both sides of the equal sign.
-3n + -24 - -24 = 15 - -24
-3n = 39
Divide 3 on both sides.
-3n/-3 = 39/-3
n = -13
Hope i helped!! :D
Answer:

Step-by-step explanation:
The Weight of Ingredients to be used by Chef Selena are:
pounds of pasta, - 6 pounds of sauce; and
pounds of onions.
Total Weight of Food Made, x

Since each serving is 
Number of Servings of her dish, y

The two equations needed to solve the problem are therefore:

F(4) = 4^2-5
f(4) = 4x4-5
f(4) = 16-5
f(4) = 11
Answer is 2 inches per hour.
12 inches/6 hours divided by 6 is 2 inches/ 1 hour.