What is the value of x? I’m pretty sure it’s 32.

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

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?

Asap! i'm not good math and i'm lost.