Can someone help me with this please???

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

()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

What dimensions can créate more than one triangle ?