Monica has been saving her spare change. So far she has saved 40 coins for a total of $6.25. Some of the coins are quarters (25 cents) and the rest are dimes (10 cents). How many of each coin does she have? Use elimination to solve.

{q+d=40
{25q+10d=625

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?

Is the square root of 4 plus the square root of 16 rational?

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with