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Firlakuza [10]
3 years ago
5

Evaluate the expression when x=-3. x^2+5x=-4

Mathematics
1 answer:
Neporo4naja [7]3 years ago
3 0

(-3)^{2} + 5(-3) = - 4\\9 - 15 = - 4\\-6 \neq -4

This is not possible, as -6 is not equal to -4.

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An elevator goes up 7 floors and then down 4 floors. What integer represents the change in the floor level?
mariarad [96]

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Going up 7 and then down 4 can be represented by 7-4=3

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3 years ago
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A lumber company is making boards that are 2920.0 millimeters tall. If the boards are too long they must be trimmed, and if the
Effectus [21]

Answer:

The value of the test statistic is of 0.22.

Step-by-step explanation:

Our test statistic is:

t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the expected mean, \sigma is the standard deviation(square root of the variance) and n is the size of the sample.

A lumber company is making boards that are 2920.0 millimeters tall.

This means that \mu = 2920.

A sample of 12 is made, and it is found that they have a mean of 2922.7 millimeters with a variance of 121.00.

This means that X = 2922.7, n = 12, \sigma = \sqrt{121} = 11. So

t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

t = \frac{2922.7 - 2922}{\frac{11}{\sqrt{12}}}

t = 0.22

The value of the test statistic is of 0.22.

4 0
2 years ago
6) 98=4b+ 2c; Find b if c=5
andreev551 [17]
The answer is b= 22 :)
8 0
3 years ago
What's the answers???? <br>7.6 x 2.9 = ?​
umka21 [38]

22.04 \\  \\ hope \: it \: helps

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2 years ago
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How do you find standard deviation?
Mila [183]
You first work out the mean then for each number subtract the mean and square the result then work out the mean of those squared differences and take the square rot of that and you're done :)
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