Please do please help with this question!

11. a particular type of cell doubles in number every hour. which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells? a. n = 4 ()" b. n = 4(2)" c. n = 4 + (2)" din = 4 +"

Can any one me with the answers to these questions asap?

Which number line represents the solution set for the inequality - x 24?