Question

I have till 4: plss help

Answer 1

`( \: 10 + 7r - {r}^(2) \: ) + ( - 6 {r}^(2) - 18 + 5r \: ) \\ \dashrightarrow \: 10 + 7r - {r}^(2) - 6 {r}^(2) - 18 + 5r \\ \dashrightarrow \: \boxed{\: - 7 {r}^(2) + 12r - 8}`

hope helpful! :)