Janet decreased her daily carbohydrate intake from 80 grams to 50 grams. By what percent did Janet decrease the amount of carbohydrates she eats?

Sketch one cycle if the cosine function y=2cos2theta

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?