Ernesto es un artesano vende sus adornos de forma esférica cuyo diámetro es de 20 cm. ¿ cuánto espacio ocupara cada adorno?

Can any one me with the answers to these questions asap?

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?