Answer:
1. 11x
2. -3xy
3. 5a
4. 4x-2y+1
5. xy (12-5y)
6. 26a²b⁴
7. 8x¹¹
8. 15x¹⁵y⁵
Step-by-step explanation:
1. 4x + 7x
(4+7)x
= 11x
2. -13xy + 10xy
= -3xy
3. -10a - -15a
-10 + 15a
= 5a
4. (x+2y-7)+(3x-4y+8)
x+2y-7 + 3x-4y+8
= 4x-2y+1
5. 12xy • 5xy²
60x+x y+y²
= 60x²y³
6. 6ab⁴• 4a
26a+ab⁴
= 26a²b⁴
7. 72x⁹÷9x²
8x⁹+x²
= 8x¹¹
8. 125x¹⁰y⁵ ÷ 5x⁵
15x¹⁰+x⁵ y⁵
= 15x¹⁵y⁵
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