11. (5 points) The population of fruit flies doubles every 3 days. There were 320 fruit flies after 15 days. a) How many fruit flies did they start with?
fill in number grid_

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Simplify the expression. -2/5(10+15m-20n)

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches