radioisotope cobalt 60, half life 5.3 years has activity of 12,400 cmp how much time has passed if the activity of the sample has dropped to 775 cpm

When the mercury level in a barometer decreases that atmospheric pressure has

Problem page a jet airplane reaches 846. km/h on a certain flight. what distance does it cover in 13.0 min? set the math up. but don't do any of it. just leave your answer as a math expression. also, be sure your answer includes all the correct unit symbols.

How many moles of sulfur dioxide are in 2.26 × 10^33 sulfur dioxide molecules?