Simplify the expression $4s+9\times5s$4s+9×5s.

Simplify the expression $14y-10y\div5$14y−10y÷5.

Simplify the expression $4y+5y\times2+3y$4y+5y×2+3y.

Simplify the expression $6\times7w+8\times3w$6×7w+8×3w.

Multiply a polynomial by a monomial involving the same variable to give results up to degree three using a variety of tools