Nevermind i got the answer

Can some one me with these questions

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

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.