Final answer:
To make six servings, Rosa will use approximately 0.9375 cups of sour cream.
Step-by-step explanation:
To find the amount of sour cream Rosa will use if she wants to make six servings, we can set up a proportion. Since the original recipe serves eight and uses 1 and 1/4 cups of sour cream, we can set up the proportion:
8 servings / 1 and 1/4 cups = 6 servings / x cups
Next, cross multiply and solve for x:
8 * x = 6 * 1 and 1/4
8x = 7.5
x = 7.5 / 8
x = 0.9375
Therefore, Rosa will use approximately 0.9375 cups of sour cream if she wants to make six servings.