Atest has multiple choice questions with 5 choices for each answer; only one answer is correct for each question. suppose a student guesses the answer to each question. assuming the guesses are independent, find the probability that the student will guess correctly when answering two questions. 1/5 1/10 1/25

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z