The table shows the parts of powder and water used to make gelatin.

Boxes of Gelatin Powder (oz) Water (cups)
3 9 6
7

At this rate, how much powder and water will Jeff use to make 7 boxes of gelatin?
Jeff will use 14 oz of powder and 21 cups of water.
Jeff will use 13 oz of powder and 10 cups of water.
Jeff will use 27 oz of powder and 18 cups of water.
Jeff will use 21 oz of powder and 14 cups of water.

Since 3 boxes of gelatin require 9 oz of powder and 6 cups of water, we can find the ratio of powder to gelatin by dividing the total amount of powder by the total number of boxes: 9 oz / 3 boxes = 3 oz/box.

Similarly, we can find the ratio of water to gelatin by dividing the total amount of water by the total number of boxes: 6 cups / 3 boxes = 2 cups/box.

Therefore, to make 7 boxes of gelatin, Jeff will need 3 oz/box * 7 boxes = 21 oz of powder and 2 cups/box * 7 boxes = 14 cups of water.

The correct answer is Jeff will use 21 oz of powder and 14 cups of water.

To find out how much powder and water Jeff will use to make 7 boxes of gelatin, we need to analyze the information from the table.

From the table, we can see that when 3 boxes of gelatin are made, 9 oz of powder and 6 cups of water are used.

This means that for 1 box of gelatin, 3 oz of powder and 2 cups of water are used.

So, for 7 boxes of gelatin, we can calculate:

7 boxes * 3 oz/powder = 21 oz of powder
7 boxes * 2 cups/water = 14 cups of water

Therefore, Jeff will use 21 oz of powder and 14 cups of water to make 7 boxes of gelatin.

The correct answer is: Jeff will use 21 oz of powder and 14 cups of water.