find the sum or difference of the ff.1.) 2×+(-5×?2.)-2a²-(6a²)=?3.)ytfy=-y4.)-aײy³-(-9ײy³5.)12 ab²-ab²6.) 16mn³+(-12mn³7.)10a²b³-(-8ab³)+a²b³8.)7×y+4×y-(-21×y)9.)-8nn²n²+7m²n²-15m²n²10.) -21×4+17×⁴​

Answer:Sure! Let's go through each item one by one. I'll simplify each expression and show the answer clearly.---1.) = 2x - 5x = \boxed{-3x}---2.) = -2a^2 - 6a^2 = \boxed{-8a^2}---3.) This looks unclear — "ytfy" is not standard notation. Did you mean:?Or something else?Please clarify this one so I can help better.---4.) = -ax^2y^3 + 9x^2y^3 = \boxed{(9 - a)x^2y^3}---5.) = (12 - 1)ab^2 = \boxed{11ab^2}---6.) = 16mn^3 - 12mn^3 = \boxed{4mn^3}---7.) = 10a^2b^3 + 8ab^3 + a^2b^3 = \boxed{11a^2b^3 + 8ab^3}---8.) = 7xy + 4xy + 21xy = \boxed{32xy}---9.) = -8n^4 + (7 - 15)m^2n^2 = -8n^4 - 8m^2n^2 = \boxed{-8n^4 - 8m^2n^2}---10.) = (-21 + 17)x^4 = \boxed{-4x^4}---Let me know if you'd like a clearer solution for number 3!

Answered by hanb64697 | 2025-07-09