How do you write 15,409 in two ways

()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

Need on this one asap im almost done with this subject

Perform the indicated operation and write the answer in the form a + bi. (-5 + 2) + (3 - 6i)