- Multiply 4 by 9 then subtract 7?

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I need help with isomers, please help.
Here are 4 problems I'm struggling with.? Como resuelvo esta divisiĆ³n de polinomio entre monomio? 20x^6y^4-12x^4y^6-9x^2y^8 / 30x^4y^3? In the animal kingdom only humans rely on? Please help!!
prove for vector functions (a X b)' = a' X b + a X b'? What will the final temp be if 3.5 kilojouls of heat is released by 35ml of water with an initial temp of 80C
I m desperate please help?