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ololo11 [35]
3 years ago
12

Can you please answer all three of these questions.

Mathematics
2 answers:
Bezzdna [24]3 years ago
8 0
What ever the guy above me said is correct
Dmitry_Shevchenko [17]3 years ago
6 0
First one is - $101.91
I’m not sure about the 2nd one but I got 6-7 percent
Third one is 70
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PetSmart.com sold the following varieties of dog food in June 2003.
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Let x  be the number of bags of Nature's Recipe Venison Meal & Rice Canine 20 percent protein, y be the number of bags of Nutro Max Natural Dog Food 27 percent protein and z be the number of bags of PetSmart Premier Oven Baked Lamb 25 percent protein a dog breeder buys. He  wants to make 300 pounds of a mix. Then

20x+17.5y+30z=300.

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Then 4x+4.725y+7.5z=66.

You get a system

\left\{\begin{array}{l}20x+17.5y+30z=300\\4x+4.725y+7.5z=66.\end{array}\right.

From the first equation z=10-\dfrac{2}{3}x-\dfrac{7}{12}y. Substitute it into the second equation:

4x+4.725y+7.5(10-\dfrac{2}{3}x-\dfrac{7}{12}y)=66.

Simplify it:

-x+\dfrac{7}{20}y=-9,\\ \\ 20x-7y=180.

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Answer: 9 bags with 1st mix, 0 bags with 2nd mix and 4 bags with 3rd mix.

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A point with a positive x-coordinate and a negative y-coordinate is reflected over the y-axis.
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