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4 years ago

12

Cameras are set up to watch an intersection and determine how many cars are let through with each green light interval. This stu

dy design would be considered:

1 answer:

sergij07 [2.7K]4 years ago

3 0

Answer Choices:

Simulation
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Observational
Experimental

Answer:

Observational

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3 years ago

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4 years ago

Read 2 more answers

4) If x-1/x=5, fand the value of x²+ 1/x²

tangare [24]

Given:

$\sf x\ -\ \dfrac{1}{x}\ =\ 5$

To find:

$\sf The\ value\ of\ x^2\ +\ \dfrac{1}{x^2}.$

Answer:

$\sf x\ -\ \dfrac{1}{x}\ =\ 5$

Let's square the above expression.

$\sf \bigg(x\ -\ \dfrac{1}{x}\bigg)^2\ =\ 5^2$

According to the identities, (a - b)² = a² - 2ab + b². Using the same logic for the expression above,

$\sf x^2\ -\ 2\ \times\ x\ \times\ \dfrac{1}{x}\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ -\ 2\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 25 + 2\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 27$

Therefore, the value of x² + 1/x² is 27.

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4 years ago