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3 years ago

Evaluate the expression xy for x = 3

Mathematics

1 answer:

Dahasolnce [82]3 years ago

4 0

Answer:

Step-by-step explanation:

$xy = 3 \times y = 3y$

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ON THIS YOU HAVE TO GRAHP EACH NUMBER INTO A NUMBERLINE

Stolb23 [73]

Answer: the answer will be plotted on the number line close or farther to zero

Step-by-step explanation: the answers has to be behind the zero

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2 years ago

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The life in hours of a 75-watt light bulb is known to be normally distributed with standard deviation σ = 25 hours. A random sam

irina [24]

Answer: a) (1008.34,1019.658) b) (1009.24,1018.76)

Step-by-step explanation:

Since we have given that

n = 75

mean = 1014 hours

Standard deviation = 25 hours

At 95% two sided , z = 1.96

So, confidence interval would be

$\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.96\dfrac{25}{\sqrt{75}}\\\\=1014\pm 5.658\\\\=(1014-5.658,1014+5.658)\\\\=(1008.34,1019.658)$

(b) Construct a 95% lower confidence bound on the mean life.

z = 1.65

So, confidence interval would be

$\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.65\times \dfrac{25}{\sqrt{75}}\\\\=1014\pm 4.76\\\\=(1014-4.76,1014+4.76)\\\\=(1009.24,1018.76)$

Hence, a) (1008.34,1019.658) b) (1009.24,1018.76)

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3 years ago

If f(x) = 8x and g(x) = 2x +1 find (f o g) (x)

Pachacha [2.7K]

Answer:

(fog) (x) = 8*(2x+1)=16x+8

Step-by-step explanation:

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2 years ago

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Find the sum of -6/ab + a^2/b^2

Ymorist [56]

Answer:

$\frac{1}{ab^{2} }$ (a³ - 6b)

Step-by-step explanation:

$\frac{-6}{ab} + \frac{a^{2} }{b^{2} }$

= $\frac{-6b + a^{3} }{ab^{2} }$

= $\frac{1}{ab^{2} }$ (a³ - 6b)

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2 years ago

What is the simplified form of left parenthesis 27 x to the power of negative six end power y to the power of 12 end power right

Tanzania [10]

Hello,
Please, see the attached file,
Thanks.

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2 years ago