A steel bar has a mass of 800 kilograms and a volume of 0.1 cubic meters. Calculate its density.
Write your answer as a whole number.
kilograms per cubic meter

I’m stuck on this i don’t understand.

For what value of (y) is 3^3/3^y =1/9

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?