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Inga [223]
3 years ago
12

Find the area, correct to the nearest square

Mathematics
1 answer:
Lady bird [3.3K]3 years ago
7 0

Answer:

1269 square meters

Step-by-step explanation:

The path and the plot of land form two concentric circles (they have the same center). The radius of the plot of land is 100m (half of the diameter) and the radius of the larger circle, formed by putting a 2m wide path around the plot of land, is 102m. Thus, the area of the path is \pi *102^2 minus \pi *100^2 which will be 10404\pi-10000\pi which is 404\pi. Estimate \pi to 3.141 and calculate, getting 1268.964... which is 1269, rounded to the nearest square meter.

Hope this helps :)

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Answer:

Step-by-step explanation:

First method: for (x+3)^2 if you multiply (x+3)(x+3) you get x^2+6x+9 which doesn't equal x^2+9

Second way:  plug in a variable for example (2+3)^2= 25 and 2^2+9=13 so 13 doesn't equal 25

8 0
3 years ago
What is the length of the missing leg
sp2606 [1]

Answer:

4.33

Step-by-step explanation:

1. Pythagoras Theorem

25 = \sqrt{3^{2}+b^{2}}

2. Find b

5 = 3^{2}+b^{2}

b^{2} = 5-3^{2} = 5-9 = -4

but sqrt(-4) is not possible

b ≅ 4

OR (Require trig knowledge)

1. Sine Rule

\frac{a}{sin\alpha}=\frac{b}{sin\beta}=\frac{c}{sin\pi }

2. Plug in numbers

\frac{5}{sin90}=\frac{b}{sin60}=\frac{3}{sin30}

b ≅ 4.33

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3 years ago
What is w - 9 = 0 ; w = 9?
just olya [345]

Answer:

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Step-by-step explanation:

basically, they're saying that

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3 years ago
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Step-by-step explanation:

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Read 2 more answers
Find the second, fourth, and eleventh terms of the sequence A(n) = 5 + (n - 1)(-3)​
klio [65]

Answer:

2nd: 2

4th: -4

11th: -25

Step-by-step explanation:

When you substitute a number into the equation you get that number term. So, if you substituted in 1, you get the first term. To find the second term, you substitute in 2:

A(2) = 5 + (2 - 1)(-3)

A(2) = 5 + (1)(-3)

A(2) = 5 - 3

A(2) = 2

To get the 4th term you substitute in 4:

A(4) = 5 + (4 - 1)(-3)

A(4) = 5 + (3)(-3)

A(4) = 5 - 9

A(4) = -4

And we do the same for the 11th term:

A(11) = 5 + (11 - 1)(-3)

A(11) = 5 + (10)(-3)

A(11) = 5 - 30

A(11) = -25

8 0
3 years ago
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