I Question 4 E 3.33/10 pts 0 3 2 91 (9 Details At the beginning of an experiment, a scientist has 100 grams of radioactive goo. After 165 minutes, her sample has decayed to 6.25 grams. What is the half-life of the goo in minutes? Z] Find a formula for C(t), the amount of goo remaining at time #5. C(25) = :] How many grams of goo will remain after 71 minutes? :] I Question 6 B 0/10 pts 0 3 2 99 G) Details The doubling period of a bacterial population is 15 minutes. At time t : 90 minutes, the bacterial population was 80000. What was the initial population at time t : 0? :] Find the size of the bacterial population after 3 hours. :] Question Help: El Message instructor Submit Question 0 Question 8 B 0/10 pts 0 3 3 99 0 Details A bank features a savings account that has an annual percentage rate of r : 2.8% with interest compounded Quarterly. Shantel deposits $7,000 into the account. In! The account balance can be modeled by the exponential formula 5' (t) : P(1 + L) , where S is the 'n, future value, P is the present value, r is the annual percentage rate written as a decimal, n is the number of times each year that the interest is compounded, and t is the time in years. (A) What values should be used for P, r, and n? (B) How much money will Shantel have in the account in 7 years? Round answer to the nearest penny. Question Help: El Video 8 Message instructor Submit