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Ulleksa [173]
2 years ago
11

-2 • (-3)3 = ? i really need help, I’m struggling so much in math.

Mathematics
2 answers:
Ronch [10]2 years ago
6 0

Answer:

The answer would be 54

Step-by-step explanation:

nadezda [96]2 years ago
4 0

Let's break this statement into small pieces. Let's start with (-3)^{3}. This means -3 \times -3 \times -3 which is equal to -27 (-3 \times -3 = 9, 9 \times -3 = -27).

Note the following rules

  • - \times - = +
  • + \times + = +
  • - \times + = -
  • + \times - = -

Now let's solve the rest of the equation. -2 \cdot (-3)^{3} = -2 \cdot -27 (Note \cdot is the same as \times. = -2 \cdot -27, 54

The answer is 54

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The age at which small breed dogs are fully housebroken follows a Normal distribution with mean ms = 6 months and standard devia
atroni [7]

Answer:

This measure is just 0.17 standard deviations from the mean, so we should not be surprised.

Step-by-step explanation:

Normal probability distribution

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

If the z-score is lower than -2, or higher than 2.5, the score of X is considered unusual.

Subtraction of normal variables:

When we subtract normal variables, the mean is the subtraction of the means, while the standard deviation is the square root of the sum of the variances.

Let xS – xL represent the sampling distribution.

Mean s 6, means L 4. So

\mu = 6 - 4 = 2

Standard deviation s is 2.5, for L is 1.5. So

\sigma = \sqrt{2.5^2+1.5^2} = 2.915

Should we be surprised if the sample mean housebroken age for the small breed dogs is at least 2.5 months more than the sample mean housebroken age for the large breed dogs? Explain your answer.

We have to find the z-score for X = 2.5. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{2.5 - 2}{2.915}

Z = 0.17

This measure is just 0.17 standard deviations from the mean, so we should not be surprised.

7 0
2 years ago
Prove that<br><img src="https://tex.z-dn.net/?f=%20%7B2%7D%5E%7B3%7D%20%20%5Ctimes%20%20%7B3%7D%5E%7B0%7D%20%20%2B%20%20%7B3%7D%
KonstantinChe [14]

Answer:

Step-by-step explanation:

Anything raise to the power zero is 1

Therefore,

               LHS\\\\ =2^3 \times 3^0 + 3^2 \times 2^0\\\\8 \times 1 + 9 \times 1 \\\\17

LHS = RHS

Hence Proved

5 0
3 years ago
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