Examine the expression. 12÷15 also please write a story promble with it represented by the expression

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

If you answer 2+2 you will get over 80 points

Two friends are reading books. jimmy reads a book with 21,356 words. his friend bob reads a book with one-and-a-half times as many words. which expression represents the number of words bob reads?