Do restrictions on variables change when a rational expression is simplified? always, sometimes, or never true

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.

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

Is a positive integer raised to a negative power always positive