How many experiment are necessary to invalidate a scientific hypothesis

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Is laundry detergent an acid or a base?

No copying 15 pts how does a free-body diagram tell you about the net force on an object?