if you select one card at random from a standard deck of 52 cards , what is the probability of that card being a 3,4,or 5?

What is (28 + 7 + 6 + 3) x 1/2 show your work

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.