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allochka39001 [22]
3 years ago
6

If the coefficient a in the general quadratic equation is equal to 9, what is the focal length for the

Mathematics
1 answer:
lutik1710 [3]3 years ago
5 0

Answer:

9

Step-by-step explanation:

Let the equation of a parabola be

y^{2} = 4ax.

Then , focal length of the parabola is a.

As , (0,0) is the vertex and its focus is (a,0)

Thus, focal length comes out to be a.

Here,

a is given as 9 units .

Thus focal length of the parabola, d, equals to 9 units

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1. Given the below sequence: -1, -3, -5, -7, . . . (a) What are the next 3 terms? (b) Is this an arithmetic or geometric sequenc
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Answer:

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(b) Arithmetic sequence

(c) There is a common difference of -2

(d) -53

Step-by-step explanation:

(a) To find the next three terms , we must firs check if it is arithmetic sequence or a geometric sequence . For it to be an arithmetic sequence , there must be a common difference :

check :

-3 - (-1) = -5 - (-3) = -7 - (-5)  = -2

This means that there is a common difference of -2 , which means it is an arithmetic sequence.

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Therefore : the next 3 terms are : -9 , -11 , - 13

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t_{27} = -1 - 52

t_{27} = - 53

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