the half life of caffeine in the human body is 5 hours. before each class your instructor consumes approximately 100mg of caffeine. how much caffeine do i have in my system at the end of one lecture? (assume i am not drinking coffee during class and that a lecture is 50 min long.)

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms