What is the y-intercept of the graph of the function f(x) = x2 + 3x + 5?

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?

4+(2+x) can you me solve this problem

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?