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lesya692 [45]
3 years ago
6

. How many faces does a polyhedron with 20 vertices and 30 edges have?

Mathematics
2 answers:
Alisiya [41]3 years ago
6 0

Answer:

12

Step-by-step explanation:

Sergio039 [100]3 years ago
4 0

Answer:

12

Explanation:

Trust!

Hope this helps! :)

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I need help pleaseeee!!!!! I don’t understand
olganol [36]

Answer:

a. x = 5, m∠FGH = 22°

b. m∠HGI = 22°

c.  m∠FGI = 44°

Step-by-step explanation:

Since GH bisects FGI this means it divides the angle in two equal parts.

a. solving for x means equating them:

5x-3 = 6x-8 =>

5x - 6x = 3 - 8 =>

x = 5.

Both m∠FGH and m∠HGI are 5*5-3 = 22°

c. Add both angles: m∠FGH + m∠HGI = 44°

8 0
3 years ago
Explore the area of sectors of circles by following these steps.
Nezavi [6.7K]

Answer: 9pi

Step-by-step explanation:

8 0
3 years ago
A flashlight has 7 batteries, 5 of which are defective. If 5 are selected at random without replacement, find the probability th
TEA [102]
71.4 % chance I think is your answer. 
8 0
3 years ago
A radio station claims that the amount of advertising per hour of broadcast time has an average of 13 minutes and a standard dev
zimovet [89]

Answer:

Z = 3.33

Step-by-step explanation:

Z-score:

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:

\mu = 13, \sigma = 1.2

You listen to the radio station for 1​ hour, at a randomly selected​ time, and carefully observe that the amount of advertising time is equal to 17 minutes. Calculate the​ z-score for this amount of advertising time.

We have to find Z when X = 17. So

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

Z = \frac{17 - 13}{1.2}

Z = 3.33

5 0
3 years ago
Annette bought 3 notebooks for $0.80 each and a pack of pens for $1.20. She gave the clerk some money and got back
kirill [66]
3(.80)+1.20= 3.60

3.60+1.40= 5

Annette gave the clerk $5
3 0
3 years ago
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