Im in the 6th and im helpful and i like to do math

1. the following set of data represents the number of waiting times in minutes from a random sample of 30 customers waiting for service at a department store. 4 5 7 10 11 11 12 12 13 15 15 17 17 17 17 17 18 20 20 21 22 22 23 24 25 27 27 31 31 32 a. determine the number of classes and class interval.

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9