CAN SOMEONE PLEASE HELP IM BEGGING. I DONT UNDERSTAND

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?

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?