Jack has 21 boys in his class. this represents 75% of the class. how many students are in the entire class

Match each expression with its simplified form.

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 suare root of 9x plus 7 plus the square rot of 2x equall to 7