Brody went on vacation and purchased postcards and stamps to send letters home while he was away. Two postcards and four stamps cost $3 . A postcard cost 4 times as much as a stamp. Set up a systems of equations that could be used to find the cost of a postcard.

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

Which of the following is an example of conditional probability