I NEED YOUR HELP YOU HAVE TO DO THE WHOLE THING PLEASE

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

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6