The number of thousands of bacteria in a culture afer n hours is 2^n+3
(a) find the initial number of thousands of bacteria.
(b) after n hours, the bacteria are divided into 2^n-1 groups. find the number of thousands of bacteria in each group.

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

If value of cos330° is √3/2 then find tan165°.