I know this has been asked a lot of times but can someone please show the steps of how to answer this? You'll get a full 25 points if you help:

Jill buys 10 shares of stock in Costco Corporation at $150 per share on January 30, a membership retailer. During the year, Costco had a dividend of $1.80 per share at the end of June and the stock rose to $164.00 a share. If Jill sold her stock on July 31, what would be her return?

The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?