A nutritionist, working for NASA, must meet certain minimum nutritional requirements and yet keep the weight of the food at a minimum. He is considering a combination of two foods, which are packaged in tubes. Each tube of food A contains 4 units of protein, 2 units of carbohydrates, and 2 units of fat and weighs 3 pounds. Each tube of food B contains 3 units of protein, 6 units of carbohydrates, and 1 unit of fat and weighs 3 pounds. The requirement calls for 48 units of protein, 42 units of carbohydrates, and 20 units of fat. How many tubes of each food should be supplied to the astronauts?

9 tubes of A and 4 tubes of B.

Step-by-step explanation:

Let the number of tubes of A and B that should be supplied be represented by letters, X and Y.

For protein,

X tubes contain 4X units of protein

Y tubes contain 3Y units of protein

4X + 3Y ≥ 48

For Carbohydrates,

X tubes contain 2X units of Carbohydrates

Y tubes contain 6Y units of Carbohydrates

2X + 6Y ≥ 42

For fats,

X tubes contain 2X units of fats

Y tubes contain 1Y units of fats

2X + Y ≥ 20

And X ≥ 0, Y ≥ 0

The objective functions put together

4X + 3Y ≥ 48

2X + 6Y ≥ 42

2X + Y ≥ 20

X ≥ 0

Y ≥ 0

So, plotting the graph to obtain optimum points.

The optimal points obtained from the graph include

(6, 8), (9,4), (0,20), (21, 0)

Putting all the optimal points into the first 3 equations

(6,8) gives 48, 50 and 20 units just like in the objective functions

(9,4) gives 48, 42 and 22

(0, 20) gives 60, 120, and 20

(21, 0) gives 84, 42, and 42.

It is evident that (9,4) is the most optimal solution.

answer: the sun

explanation:

water cycle describes the evaporation of water from earth's surface, formation of clouds and precipitation water back onto the surface of earth. seventy percent of the earth is covered with water in the form of seas and oceans. the heat of the sun causes the evaporation of water from the surface of the ocean. the water vapors rise and condense to form water droplets. the collection of these water droplets form clouds which rain down again.

the evaporation of the oceans surface water as part of the water cycle is caused by the sun

the football players are volunteering for the test.

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