Dinner cost $45.50 you left 20% how much did you spend

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

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?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry