15) The D. O.T. collected data for a particular stretch of 1-85 and found that the average speed was 70 mph with a standard deviation of 15 mph and the
distribution is approximately normally distributed. The actual Speed Limit for the
stretch of road is a maximum of 70 mph and minimum of 40 mph. What
percentage of drivers actually drive between 40 mph and 70 mph?*

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.