Someone needed help with these questions, I couldn't answer it since two people are already answering it soo... Please help him/her!

Which statement about perfect cubes is true

Graph red beads cost $1 an ounce and gold beads cost $3 an ounce. juanita wants to purchase a 12-ounce mixture of red and gold beads that she can sell for $2 an ounce. the solution of the system shows the number of beads needed for juanita to break even. x + y = 12, x + 3y = 24 how many ounces of red beads will juanita buy to break even? how many ounces of gold beads will she buy?

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?