Element X decays radioactively with a half life of 13 minutes. If there are 400 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 4 grams?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

Christine wong has asked dave and mike to her move into a new apartment on sunday morning. she has asked them both, in case one of them does not show up. from past experience, christine knows that there is a 40% chance that dave will not show up and a 30% chance that mik a. what is the probability that both dave and mike will show up? (round your answer to 2 decimal places.) b. what is the probability that at least one of them will show up? c. what is the probability that neither dave nor mike will show up? (round your answer to 2 decimal places.)e will not show up. dave and mike do not know each other and their decisions can be assumed to be independent.