Someone please help find the domain and range

He concluded that a heavier object dropped from the same height as a lighter object will land

An equation representing lyle’s hedge-trimming business is a = 12n - 300 where a is the amount of profit or loss in dollars and n is the number of hedges trimmed. how would the graph of lyle’s business change if the equation a = 10n - 300 represented his business? the graph would be flatter. the graph would be steeper. the graph would start closer to the origin. the graph would start lower on the y-axis.

Suppose i flip two identical coins. what is the probability that i get one head and one tail?