The standard form equation: x2+y2=16, what is the general form for this equation

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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?

Ineed to know the answer to this algebra question.