What is the relationship between 0.8 ÷ 10^2 and 0.8×10^2

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?

I’m really confused and need to learn this

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0