Compute each of the following values

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

If you are dealt 4 cards from a shuffled deck of 52? cards, find the probability that all 4 cards are diamondsdiamonds.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?