Help me pls❤️anything will help :))

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?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?