Which expression is equivalent to 2r + 7r?

9r

Step-by-step explanation:

You add like terms so if you add 2r and 7r, you get 9r

answ9x x 3=

step-by-step explanation:

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}