Asnowboarder descends a 1200-foot hill in 3 minutes. what is the mean change in elevation per minute? (400 is not correct! )

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

For the equations below which statement is true ? -2x=14 6x=-42

How is working backward similar to solving an equation?