Who wants to my bff and a hug

Ascientist wants to find the radius in meters of his hemispherical dome he found that the surface area of the entire sphere containing the dome is 682 square meters which equation could he use to find the domes radius

Robbie owns 15 percent more movies than rebecca and rebecca owns ten percent more than joshua rebecca has 220 movies how much do robbie and joshua each have

What is the missing step in this proof? scroll down to see the entire proof. u