if the lab technication needs 30 liters of a 25% acid solution how many liters of the 10% and the 30% acid solutions should she mix to get what she needs

The circumference of a circle is 5 pi cm. what is the area of the circle?

What term makes it inconsistent y=2x - 4

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?