A. Find the equation of the straight line through the points A(-1,5) and B(3,1).

b. Hence find the size of the angle which AB makes with the positive direction of the x-axis.

(I'm stuck on b mainly, a is to just help everyone else)

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?