Can someone plz answer this, thanks if you do, I'll Mark brainliest if you get it right

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Find the area of an equilateral triangle with a side of 6 inches

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?