What is the reciprocal of 5 1/4​

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

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?