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tankabanditka [31]
3 years ago
7

If a=2,b=-1,c=-3 and d=-2.find the value of 7a2-3ac+d2​

Mathematics
1 answer:
hram777 [196]3 years ago
3 0

Answer:

42

Step-by-step explanation:

It's just a distribution property where the given value of each variables (a, b, c, d) are being distributed to the given equation:

7a2-3ac+d2

7(2)(2) - 3(2)(-3) + (-2)(2)

28 + 18 - 4 = 42

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Answer:

There are  10 pigs and 30 chickens

Step-by-step explanation:

Let the number of pigs be x

let the number of chickens be y

Then there are 40 heads . So the total number of pigs and chickens is 40

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Solving (1) and (2)

multiply  (1) by 2

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subtract (3) from (2)

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3 years ago
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3 years ago
(04.05) Evan spent 20 hours doing homework last week. This week he spent 25 hours doing homework. He says that he spent 125% mor
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Answer:

Evan is correct

Step-by-step explanation:

To find this answer, we can use the formula A=PxW

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