Combine like terms together
-9r-8(5r+4)
I need this answer quick please it's for a quiz​

  best answer for the question.1.     divide  7/24  by  35/48  and reduce the quotient to the lowest fraction. 

Which of the following expressions is equal to 2x^2+8

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible