Someone pls answer my question for history

What is the area of the trapezoid shown ?

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?

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42