Which method of gathering data will be most effective in learning how diet and fitness choices affect long-term health?

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?

The formula for the volume of a right square pyramid is given below, where a is the side length of the base and h is the height.

The hockey team has been great! in 2008 they won 20% more games than in 2007. in 2009 they won 50% more games than in 2008. what was their overall percentage increase from 2007 through 2009?