Find the slope of the line through each pair of points
1) (20, 12), (-13, 18)
2) (-10, -16), (4,1)
3) (-9,8),(0,2)
4) (7,0),(5,-1)
5) (-5,13),(14,12)
6) -9,-8),(5,-6)
7) (-6,20),(9,15)
8) (6,17),(-19,-5)
9) (-6,-4),(13,18)
10) (19,-12),(-9,20)

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?