The line plot shows the amount of time (in hours) that Jodi practiced the flute over 8 days.

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)