X + 4 + 3x = 72 how did you get this answer?

What is the rule for reflection across the y axis

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

1: 4 if the wew 35 surfboards at the beach how many were short boards?