which expression results from using the distributive property?
number 1: 7(x+3) a.7x+3 b. 7 x + 3. c.21x d. X + 21
number 2: 3(6+r) a.6+r b.6+3r c.18r d.18+3r
number 3:12(n+2) a.12n b.n+24 c.12n+24 d.24n​