Can someone answer this? Thanks a lot

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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.

Ab based on the given diagram, if m_1 = 60° then m 2 = 30 60 90 180