Solve the following problems

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

()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

Divide. write in the simplest form. 4 1/6 divided by 10