What is the next number in the sequence -11,-17,-15,-21

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.

How do i i solve this equation? -18 = x/3 + 3

Can you divide 25 into 4 equal groups? explain why or why not.