How do we test a graph to see if it is a function

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?

Item 1 solve for s. s+24=90 −114 −66 66 114

Are the corresponding angles congruent? explain why or why not.