An Engel curve:. A. slopes upward for normal goods and downward for inferior goods.
B. slopes upward for inferior goods and downward for normal goods.
C. slopes downward for both normal and inferior goods.
D. slopes upward for both normal and inferior goods.

A. slopes upward for normal goods and downward for inferior goods.

Explanation:

In the case of Engle curve it plots the relationship between income and demand for a good.

In the case of the normal goods, as the income rises the demand also rises while on the other hand in the case of inferior goods, the income rises the demand false

So it sloped upward for the normal goods and slop downwards for the inferior goods  

answer; vertical marketing system;

a recipe serves 8 people, and calls for 5 lbs of apples and 2 cups of flour. you want to prepare it for 24 people. divide 24 by 8 to get 3, and then multiply your ingredients by 3.

so for 24 people, you'll need 15 lbs of apples, and 6 cups of flour.