The sum of 4 times a number and 7 is 19

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.

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

I’m really confused and need your assist me with this question i’ve never been taught