For each triangle find the missing length. Around your answer to the nearest tenth. Then find the area and the perimeter.

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?

How do you use the elimination method for this question? explain, because i really want to understand!

Find the difference (8ab+a+2) - (3ab+6)