Marisa has 24 quarters to play games at a carnival. she only wants to play ring toss and knock down the clown. if each game costs 3 quarters, and she plays ring toss at least three times, how many different ways can marisa play the two games?

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?