Mark made a business trip of 259.5259.5 miles. he averaged 59mph59⁢mph for the first part of the trip and 57mph57⁢mph for the second part. if the trip took 4.54.5 hours, how long did he travel at each rate?

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655