57 first-year teachers and 19 experienced teachers attended a school staff meeting meeting. what percentage of the teachers in the meeting were first-year teachers?

write your answer using a percent sign (%).

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

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

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry