CAN SOMEONE PLS ANSWER THIS AND EXPLAIN

Answer question above and explain each step : )

The parabola opens: y=√x-4 (principal square root) up down right left

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.