Solution:Step 1: Calculate the flour Sasha brought.Sasha brought 2 bags × (3/4 cup/bag) = 1.5 cups of flourStep 2: Calculate the flour Emily brought.Emily brought 9 bags × (1/4 cup/bag) = 2.25 cups of flourStep 3: Calculate the total flour they brought.Total flour = 1.5 cups + 2.25 cups = 3.75 cupsStep 4: Calculate the flour still needed.Flour needed = 4 cups (recipe) - 3.75 cups (brought) = 0.25 cupsFinal answer: They still need 0.25 cups (or 1/4 cup) of flour for the recipe.