Use the factor theorem to determine if the binomial is a factor of the the polynomial

Find the cosine function that is represented in the graph.

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

Which equation can be solved to find x the measure of jk in the apex