Consider the expression

Mathematics

2 answers:

Anna007 [38]3 years ago

7 0

Answer:

second one

Step-by-step explanation:

Hatshy [7]3 years ago

6 0

Answer:

3rd One

Step-by-step explanation:

xy^-2= x^-2 y^-2

Anything raised to the negative power can be modeled as $a^{-x} = \frac{1}{a^{x} }$

solve for the lower one and you will get the third answer.

Hope this helps.

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Two angles in a triangle have measures of 25° and 55°.

rosijanka [135]

Answer:

B) 100

Step-by-step explanation:

All 3 interior angles of a triangle add up to 180 so:

x + 25 + 55 = 180

x + 80 = 180

x = 180 - 80

x = 100

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Whats the area of 8ft, 6ft and 2ft?

Vitek1552 [10]

Answer:

Step-by-step explanation:

8x6=48

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A set of city temperatures in April are normally distributed with a mean of 19.7 degrees Celsius and a standard deviation of 2 d

Sati [7]

Answer:

19.77% of average city temperatures are higher than that of Cairo

Step-by-step explanation:

Problems of normally distributed samples are solved using 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.

In this question, we have that:

$\mu = 19.7, \sigma = 2$