Pam is looking for a new car. she has test-driven two cars but can only purchase one. the probability that she will purchase car a is 0.46, and the probability that she will purchase car b is 0.34. what is the probability that she will not purchase either car a or car b?
0.12
0.40
0.20
0.80

Carmen and matt are conducting different chemistry experiments in school. in both experiments, each student starts with an initial amount of water in a flask. they combine two chemicals which react to produce more water. carmen's experiment starts with 30 milliliters of water in a flask, and the water increases in volume by 8.5 milliliters per second. matt's experiment starts with 10 milliliters of water and increases in volume by 28% each second.