Does anybody wanna talk to me i dont care about what it can be anything

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

It says factor each expression 49x-28?

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