how many 4 digits greater than 3,000 can be formed using the elements of P={1,2,4,5} without repetition

Renita analyzed two dot plots showing the snowfall during the winter months for city a and for city b. she found that the median snowfall is 5 inches less in city a than in city b. the mean snowfall is about 2 inches less in city a than in city b. which explains why there is a difference in the measures of center for the sets of data?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

How can you construct perpendicular lines and prove theorems about perpendicular lines