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Evgen [1.6K]
3 years ago
9

I don't understand parabola's ?

Mathematics
2 answers:
Ksivusya [100]3 years ago
6 0
<span>a symmetrical open plane curve formed by the intersection of a cone with a plane parallel to its side. The path of a projectile under the influence of gravity ideally follows a curve of this shape.</span>
vovikov84 [41]3 years ago
4 0
Well, according to the dictionary, a parabola is: "<span>a symmetrical open plane curve formed by the intersection of a cone with a plane parallel to its side. The path of a projectile under the influence of gravity ideally follows a curve of this shape."
or "</span><span>The </span>parabola<span> is the curve formed from all the points (x, y) that are equidistant from the directrix and the focus. The line perpendicular to the directrix and passing through the focus (that is, the line that splits the </span>parabola<span> up the middle) is called the "axis of symmetry"".</span><span>
Hope this helps~!
~{Dunsforhands}</span>
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J. Reexamine the sequence 20, 14, 8, 2, ... from the problem
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Answer:

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Step-by-step explanation:

<u>Step 1</u> :-

Given sequence is 20,14,8,2,.......this sequence in arithmetic progression but this sequence is decreasing sequence.

given first term is 20 and difference isd = second term- first term = 14-20=-6

now the nth term of given sequence is

by using formula t_{n}=a+(n-1)d

t_{n}= 20+(n-1)(-6)

t_{n}= 20-6 n+6

final answer:-

t_{n} = 26-6 n

<u>verification</u>:-

t_{n} = 26-6 n

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put n=2 we get second term is 14

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so the n th term of sequence is

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