a teacher demonstrates a chemical reaction. a student observes that the test tube in which the reaction occurs becomes warm. what is the source of the thermal energy generated by the reaction?

Abag contains even and odd numbered balls in the ratio of 3: 7, respectively. for each of the following, what is the probability of drawing an even-numbered ball? the total number of balls is 240 and 30 of the odd-numbered balls are renumbered by multiplying the numbers by 4.

Dan runs a busy desktop-publishing company. his company want to increase its exposure, so it runs a new a new promotion each week. the tool dan most likely choses to publicize this is a promotion is a

Aweighted gpa counts more highly