What is the equation used to calculate the density of uo2?

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

If a simple machine reduces the strength of a force, what must be increased?