Simplify Each Expression By Combining Like Terms. 1) 11x+9x
2) 8y-7y
3) 5t-7t
4) -n+4n
5) 5w^2 + 12w^2
6) 2x^2 - 9x^2
7) -4y^2 + 9y^2
8) 6c-4 + 2c-7
9) 5-3x+y+6

1) 11x + 9x

= 20x

2) 8y - 7y

= 1y

= y

3) 5t - 7t

= -2t

4) -n + 4n

= 3n

5) 5w² + 12w²

= 17w²

6) 2x² - 9x²

= -7x²

7) -4y² + 9y²

= 5y²

8) 6c - 4 + 2c - 7

= 8c - 11

9) 5 - 3x + y + 6

= 11 - 3x + y

h df tyjgtyj ttd y ytkgfty ty

step-by-step explanation:

tyty jry j y yj yttj yhgtyj y ghyj ytthj

no not all of them.

step-by-step explanation:

some of them have a square base.