Answer:
31st term = 84
Step-by-step explanation:
Given:
204, 200,196,...
Find:
31st term
Computation:
204, 200,196,...
First term a = 204
Difference d = a3 - a2
Difference d = 196 - 200
Difference d = -4
An = a + (n-1)d
A31 = 204 + (31-1)(-4)
A31 = 204 - 120
A31 = 84
Using a system of equations, it is found that:
- There are 8 chickens in the yard.
- There are 16 pigs in the yard.
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This question is solved using a system of equations. I am going to say that:
- x is the number of chickens.
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- A chicken has 1 head, as do a pig.
- There are 24 heads.
Thus:

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- A chicken has 2 feet.
- A pig has 4 feet.
- In total, there are 80 feet.
Thus:

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Number of chicken:
Since 






There are 8 chickens in the yard.
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Number of pigs:

There are 16 pigs in the yard.
A similar problem is given at brainly.com/question/24104709
Answer:

Step-by-step explanation:
The standard equation for a circle is given by:

Where (h, k) is the center and r is the radius.
We know that the center is (-4, 8). So, substitute -4 for h and 8 for k:

Simplify:

Now, we will need to find r.
We know that it passes through the point (-2, -1). So, we can substitute -2 for x and -1 for y and solve for r. So:

Evaluate:

Square:

Add:

So, r squared is 85.
We don’t actually have to solve for r itself, since we will have to square it anyways.
So, we have:

Substituting 85 for r squared, we get:

And we have our equation.
To isolate b, add a and subtract c to the entire equation:
D - a + c = -b
Muliply b by -1 to eliminate the negative:
-D + a - c = b