If y=3x^3+x^2-5 and z=x^2-12 what polynomial is equivalent to 2(y+z)

Avegetable farmer fills of a wooden crate with of a pound of tomatoes. how many pounds of tomatoes can fit into one crate? a. 14/15 of a pound b. 2 1/10 pounds c. 1 1/14 pounds d. 10/21 of a pound