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VLD [36.1K]
3 years ago
10

Please HELPPPPPPPP jkskjqinunuanuanunwuniam

Mathematics
1 answer:
valentina_108 [34]3 years ago
4 0

Answer:

kakss ke sjene oeejrneme kenej ok?

Step-by-step explanation:

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What two numbers have a product of -2 and a sum of 7
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<em>Greetings from Brasil...</em>

According to the statement of the question, we can assemble the following system of equation:

X · Y = - 2      i

X + Y = 7       ii

isolating X from i and replacing in ii:

X · Y = - 2

X = - 2/Y

X + Y = 7

(- 2/Y) + Y = 7     <em>multiplying everything by Y</em>

(- 2Y/Y) + Y·Y = 7·Y

- 2 + Y² = 7X     <em> rearranging everything</em>

Y² - 7X - 2 = 0      <em>2nd degree equation</em>

Δ = b² - 4·a·c

Δ = (- 7)² - 4·1·(- 2)

Δ = 49 + 8

Δ = 57

X = (- b ± √Δ)/2a

X' = (- (- 7) ± √57)/2·1

X' = (7 + √57)/2

X' = (7 - √57)/2

So, the numbers are:

<h2>(7 + √57)/2</h2>

and

<h2>(7 - √57)/2</h2>
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3 years ago
A function has a constant doubling time. What type of function does this<br> represent?
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Answer:

  an exponential function

Step-by-step explanation:

An exponential function has the characteristic that it increases by a constant factor when the independent variable increases by a constant increment. The function you describe is an exponential function.

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It can be written in the form ...

  f(t) = f(0)·2^(t/d) . . . . . where d is the doubling time

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