Thomas scored 257 points on the first three tests in class. What does he need to score on the next test to have a test average of 85? A.
83

B.
79

C.
87

D.
91

Please help me

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?