X=5 because that’s the slope of the question
1. By combining like terms
2. Same variable = same term, so you can combine them
3. Because 2y - y = 1y , and 1y is the same as y because a y is one y (obviously)
4. 1/2 + 1/2 = 1. A half an x and a half an x makes one whole x, therefore, x
5. No. You solve them like you would a normal equation with like terms. So it would be 3z^2
Hopefully these are right, I’m a bit rusty!
6. 4x
7. 3y
8. y - 4.5
9. 3.5x + 2
10. 4y + 2
11. 7x
12. 2.2w - 0.5
13. 23b + 6.6
14. 3.75x + 1.5
15. 0.8x + 2.1
Good luck, I hope this helped
Answer:

Step-by-step explanation:
Given


Required
The total price for 5 days
First, calculate the total for a day.


Open bracket

For 5 days, the total will be.
Total = days * sales of a day
So, we have:
![Total = 5 * [ 125x^3 + 25x^2 + 25x]](https://tex.z-dn.net/?f=Total%20%3D%205%20%2A%20%5B%20125x%5E3%20%2B%2025x%5E2%20%2B%2025x%5D)

1+3+3+4+6+9+9 is 35
7 numbers so divide by 7
35/7 = 5
Mean is 5