Need help please with the step by step explanation

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.

What is the value of x in the equation 6(x + 1) – 5x = 8 + 2(x – 1)?

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply