Plot each value on a number line

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

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2