Abag contains 3 red marbles,4 black marbles, and 5 yellow marbles. what are the chances of picking a marble that is not black

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?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Which of the following expressions is equal to 2x^2+8