The school store sells packs of 12 pens for $2.40. which is not a unit rate to describe this sale? a. 20 cents per pen b. 5 pens per dollar c. 2.40 dollars per pack of pens d. 120 pens per 24 dollars

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