Please I need help thank you so much

What are the soultion(s) to the quadratic equation 40- x^2=0

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

X2 + y 2 = 36 x + y = 6 solve the system of equations.