Suppose you draw n lines in the plane so that every pair of lines cross (no lines are parallel) and no three lines cross at the same point. this will create some number of regions in the plane, including some unbounded regions. call the number of regions r n . find a recursive formula for the number of regions created by n lines, and justify why your recursion is correct.

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean

What is the value of x? enter your answer in the box. x =

The actual length of side t is 0.045cm. use the scale drawing to find the actual side length of w