I need help with 4,5,6

()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

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.