Which of the following expresses 12 + 42 by using the GCF of the two numbers? 3(9 + 14)
3(4 + 38)
6(2 + 7)
6(6 + 36)

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.