A girls returned from a store with $2.80 in change. She had twice as man quarters as nickels. She had two more dimes than nickels. How many nickels, dimes and
quarters did she have?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?