Measure of the number of waves that pass a point in a given amount of time

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

This is one type of line graph in which the independent variable is time plotted on the x axis and the dependent variable, also numerical, is plotted on the y axis.