Let m(k)=5k6+6k2 . what is the average rate of change of m(k) with respect to k as the value of k changes from 2 to -9

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y