6th grade math help me please :))

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x, y) ?

Alana has 12.5 cups of flour with which she is baking four loaves of raisin bread and one large pretzel. the pretzel requires 2.5 cups of flour to make. how much flour is in each loaf of raisin bread? explain the steps to follow to get the answer.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16