Please help, and give the sample text! Why can you use fraction multiplication to check the answer to a fraction division problem? How do you use multiplication to check a division problem?

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

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?