Final answer:
The question involves the use of the exponential growth formula. Given P0 = 19 and r = 0.4, the exponential growth formula is Pn = 19 * e ^(0.4t). P11, or the population after 11 time periods, can be found by substituting t = 11 into the formula.
Step-by-step explanation:
The given question deals with exponential growth, a concept in mathematics. The explicit formula for exponential growth is given by Pn = P0 * e ^(rt), where Pn is the future population size, P0 is the initial population size, r = growth rate, t = time, and e is the base of the natural logarithm.
Here, the initial population P0 is given as 19, and the growth rate r is 0.4. Plugging these values into the formula, we get Pn = 19 * e^(0.4t).
To find P11 (the population after 11 time periods), you substitute t = 11 into the formula. Hence, P11 = 19 * e^(0.4 * 11).
Learn more about Exponential Growth