<3 and <4 are supplementary. If <4 = 78° then what is the measure of <3?

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.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

How do i do this activity, is appreciated