Can someone Plss help with these

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

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?

In angle pqr find the measure of