Pls answer these i dont know how it is or whats the answer

9) A. -4x + y + 6z

10) A. 8x² - x - 2

Step-by-step explanation:

9)

(2x + 5y - z) + (-6x - 4y + 7z)

2x + 5y - z - 6x - 4y + 7z

-4x + y + 6z

10)

(3x² - 5x - 6) + (5x² + 4x + 4)

8x² - x - 2

U can use math-way too

answer: i would say b

step-by-step explanation:

with the way the question is worded, i believe b is the answer

the cost of the apple depends on the weight

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!