How much pure antifreeze must be added to 12 gallons of 10% antifreeze to make 70% antifreeze solution

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

Simplify the expression. -2/5(10+15m-20n)

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2