I just need to know if this statement is true or false

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

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 value of cos 30° is the same as which of the following?