Help I have no idea what to do

Find the values of y: 3y^3(y^2+ 2/3y)=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 length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?