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AURORKA [14]
3 years ago
9

20n^2+3n=12n^2+4identify a,b,c​

Mathematics
1 answer:
masya89 [10]3 years ago
6 0

Answer:

a)  a=8,  b=3,  c=-4

b) (-3 + \sqrt{137})/16, (-3 - \sqrt{137})/16)

c) roots in decimal form are 0.54 and -0.92

Step-by-step explanation:

a) 8n² + 3n - 4

b) (-3±\sqrt{9+128}) ÷ 16

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Answer: 32 paving stones

Step-by-step explanation:

Hi, to answer this question, first we have to convert the measures of the paving stones into meters.

Since: 1m = 100 cm

50 cm /100 = 0.5m

Now, we have to calculate the area of each paving stone:

Area of a square: s^2 = 0.5^2 = 0.25m2

Next, the area of the path.

Area of a rectangle = width x length = 1 x 8 = 8 m2

Finally, we have to divide the area of the path by the area of each paving stone:

8/0.25 = 32 paving stones

Feel free to ask for more if needed or if you did not understand something.

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Answer 4.6

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What is the length of Line segment B C? 9 units 11 units 15 units 16 units
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Answer:

15 units

Step-by-step explanation:

<u><em>The picture of the question in the attached figure</em></u>

we know that

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we have

AB=17\ units\\AC=8\ units

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Answer: Length of shorter tree = 7.2 feet .

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Given : Height of two trees as 50 feet and 20 feet.

At same time the angle made by sun rays would be same for both trees.

Both trees are vertical to the ground making right angle so triangles made by both triangles must be similar.

Corresponding sides of similar triangles are proportional.

So \dfrac{\text{length of the shadow of the shorter tree}}{\text{height of shorter tree}}=\dfrac{\text{length of the shadow of the bigger tree}}{\text{height of bigger tree}}\\\\=\dfrac{\text{length of the shadow of the shorter tree}}{20}=\dfrac{18}{50}\\\\\Rightarrow\ \text{length of the shadow of the shorter tree}=\dfrac{18}{50}\times20\\\\\Rightarrow\ \text{length of the shadow of the shorter tree} = 7.2

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