Problem 1. How many words can be made by rearranging aabbccdd, such that no 'a' appears somewhere to the right of some 'c'? Justify your answer

7. Find ap (la-) -1

John Wallis and other 17th century mathematicians were struggling with how to fit negative numbers into arithmetic without introducing inconsistencies. Explain the reasoning leading to Wallis's paradoxical claim that, if negative numbers are less than zero, they must be greater than infinity. Wallis's argument depends, in part, on the assertion that (3/-1) = -3. Must this be true? Why or why not? If a student proposed Wallis's argument, how would you respond?

Write the faction 19/15, 5/3 and 10/9 in sexagesimal notation