Find mb if mAB equals 120° in MH equals 42°

How do i do this using elimination 2x+3y=12 x-y=6

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Write the rational number in lowest terms 99/-15