Can someone help me I really don't get it 12 POINTS

Mathematics

1 answer:

Reil [10]3 years ago

4 0

Okay so for the first one, letter A, it is a pentagon because it has 5 sides. It doesn't need to be all equal sides because it's not a equilateral pentagon.
For letter B, it does not because that shape does not have all equal sides (If it does then it will have the line marks.
For letter C, it is not a equilateral pentagon with at least one right angle because it isn't even a equilateral pentagon in the first place and a right angle is 90 degrees. I hope this helps!

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Solve the equation 4n2 − 16n − 84 = 0 by completing the square.

melomori [17]

4n² - 16n - 84 = 0

Multiply both sides by 1/4 :

n² - 4n - 21 = 0

Add 21 to both sides:

n² - 4n = 21

Complete the square by adding 4 to both sides:

n² - 4n + 4 = 25

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Solve for n :

n - 2 = ± √25

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A fish story: The mean length of one-year-old spotted flounder, in millimeters, is 127 with standard deviation of 22, and the me

pishuonlain [190]

Answer:

The z-score for this length is of 1.27.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

One-year-old flounder:

Mean of 127 with standard deviation of 22, which means that $\mu = 127, \sigma = 22$