What is (-i)^5?

a. -1
b. 1
c. i
d. -i

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 someone me with this problem i don't understand i need

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount