Based on the spreadsheet below, which of the following is a true statement? A 2-column spreadsheet showing Cash Inflows and Cash Outflows. Cash inflows are Disposable income 1,600 dollars, interest on deposits 0 dollars, income from investments 0 dollars, with total cash inflow blank. Cash outflows are rent 575 dollars, utilities 120 dollars, cable and telephone 80 dollars, groceries 320 dollars, car expenses 150 dollars, recreation 80 dollars, insurance 115 dollars, miscellaneous 50 dollars, with total cash outflow blank. a. The net cash flow is negative. b. The net cash flow is zero. c. The net cash flow is positive. d. The net cash flow can’t be determined.

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?