Aparticular isotope has a half-life of 74 days. if you start with 1 kilogram of this isotope, how much will remain after 150 days? after 300 days?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters