The number of bacteria in a certain population increases according to a continuous exponential growth model, with a growth rate parameter of 8.3% per hour. how many hours does it take for the size of the sample to double? note: this

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.