Ineed the answers for 6 & 7 i will give brainlist: )

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?

Asphere has a diameter of 10 in. what is the volume of the sphere?

True or false? a circle could be circumscribed about the quadrilateral below.