Free points please go an try to answer my last question i really need help

What are the domain and range of the function? f(x) = -4 (sqrt)x

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

If the value of x increases by 5, how does the value of m(x + 3) change? a) it increases by 5m. b) it increases by 8m. c) it decreases by 5m. d) it decreases by 8m.