Select the expression that is equivalent to (x+6)^2

Find the measures of the complement and the supplement of each angle, m

Ihave trouble finding the nth term of a linear sequence

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.