To prepare for a lab experiment, Ted is making a solution that uses two types of concentrations of HCI (hydrochloric acid): 80 ml of 50% HCI solution, and 120 ml of 20% HCI soulution. What is the HCI concentration of the mixed solution?

Which graph represents the parent function of y=(x+2)(x-2)

The radius of a sphere is 3 inches. which represents the volume of the sphere?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?