Can someone me with the interval notation for 12

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

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.

What is x3+3x2−16x−48 divided by x−1?