Koen and Devonte are scheduled to take their stats exam. The probability that Koen passes is 0.40. The probability that Devonte passes 0.60. If the two events are independent, which statement is correct?

A) The probability that exactly one passes is 0.0576
B) The probability that exactly one fails is 0.52
C) The probability they both pass is 0.20
D) The probability they both pass is 1.0
E) The probability they both fail is 1.0.

Simplify. 3(4+4x) (type your answer in with no spaces)

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?

Graph each quadratic function and identify its key characteristics. f(x) = x^2 - 2x - 3