The doubling period of a baterial population is 10 minutes. At time t=120 minutes, the baterial population was 80000.
What was the initial population at time t=0
Find the size of the baterial population after 3 hours.

Find the multiplicative inverse of 8-12i

Find the solution of this system of equation -7x+y=-20 9x-3y=36

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.