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3 years ago

QUESTION 2

Mathematics

1 answer:

mihalych1998 [28]3 years ago

3 0

One piece will be length x and the other piece will be 20 cm longer, so it will be x + 20 cm long.

Added together the length of these two boards will equal 86 cm. So you can write an equation:

x + (x + 20) = 86

Remove the parentheses and add the two x's together to get:

2x + 20 = 86

Subtract 20 from both sides:

2x = 66

Divide both sides by 2 and you have:

x = 33

The short piece is 33 cm and the other piece is 20 cm longer or 33 + 20 = 53 cm.

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Answer:

The upper limit of the 95% confidence interval is:

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Step-by-step explanation:

The formula is given as:

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The upper limit => C.I_u = μ + Z*σ/ $\sqrt{n}$

The lower limit => C.I_l = μ - Z*σ/ $\sqrt{n}$

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= 200 + 58.8/ $\sqrt{n}$

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Step-by-step explanation:

<h2>Answer:-</h2>

$\tt{6+2n = 10}$

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$\tt{2n = 4}$

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$\boxed{\tt{n=2}}$

Hope it helps :)

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