I don't understand where to begin on this homework assignment. I've attached the document.

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

Drag the tiles to the correct boxes to complete the pairs. label each function. as even , odd, or neither.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b