Mathematics: How to factor 15x-7x-2

Step-by-step explanation:As per given we have,n=60Critical value for 95% confidence : Confidence interval :Hence, a 95% confidence interval for the population mean wind speed at this site. =...

How to factor 15x-7x-2 - id15725822881, gjfhjgg2848

Ответ:

shaylawaldo11

22.01.2022

Mathematics

Use the butterfly method: you need to find two numbers that add up to a times c = 15 times -2 = -30, and the same two numbers need to add up to -7.

These two numbers are -10 and 3.
(-10)(3) = 30 and -10 + 3 = -7

Factored form: ( x - 10 )( x + 3 )

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Ответ:

shongmadi77

24.05.2022

Mathematics

$(1006.68\ cm/sec,\ 1143.32\ cm/sec)$

Step-by-step explanation:

As per given we have,

n=60

$\overline{x}=1075\ cm/sec\\\\ \sigma=270\ cm/sec$

Critical value for 95% confidence : $z_{\alpha/2}=1.96$

Confidence interval :

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=1075+(1.96)\dfrac{270}{\sqrt{60}}\\\\\approx1075\pm68.3194\\\\=(1075-68.32,\ 1075+68.32)\\\\= (1006.68,\ 1143.32)$

Hence, a 95% confidence interval for the population mean wind speed at this site. = $(1006.68\ cm/sec,\ 1143.32\ cm/sec)$

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How to factor 15x-7x-2

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