30(1.25)x is it growth or decay and whats the rate

For what values of x is x2 + 2x = 24 true?

Sketch one cycle if the cosine function y=2cos2theta

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?