Save my life and help me please?

A hypothesis is a proposed explanation for an observable phenomenon. In your example, you're observing snow and ice levels as a function of salt added, and then stopping distances based on the amount of ice present. While the above answers suggest ways to test the hypothesis, they are not actually stating the hypothesis. Your hypothesis is that salt melts ice and snow, and air planes stop better on bare runways, so salt applied to an icy runway will allow airplanes to stop more quickly.