I'll give a brainliest just give me the answer.

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?

Find the domain and range of the following function f(x) = 51x - 21+ 4

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30