I think the app stopped working 4 me​

The product of two negative rational numbers is always zero sometimes zero never zero

What describes horizontal cross section of the right rectangle 6m 8m 5m

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?