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tekilochka [14]
3 years ago
11

Please ANSWER 15 POINTS

Mathematics
1 answer:
lapo4ka [179]3 years ago
8 0

The answer is A. Battery

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The price of a television was reduced from $250 to $200. By what percentage was the price of the television reduced?
gavmur [86]

Answer: C

Step-by-step explanation:Well the change in price was 50 dollars

Now divide your change in price by the original price

50/250=.2

To get that into a percentage multiply it by 100 and you get 20%

The answer is C

6 0
3 years ago
Read 2 more answers
Suppose we want a 90% confidence interval for the average amount spent on entertainment (movies, concerts, dates, etc.) by fresh
katovenus [111]

Answer:

609

Step-by-step explanation:

Standard deviation = \sigma = $30

Margin of error = E = $2

Confidence level = 90%

Since the distribution is said to be normal, we will use z scores to solve this problem.

The z score for 90% confidence level = z = 1.645

Sample size= n = ?

The formula to calculate the margin of error is:

E=z\frac{\sigma}{\sqrt{n}}\\\\\sqrt{n}=z\frac{\sigma}{E}\\\\n=(\frac{z\sigma}{E} )^{2}

Using the values in above equation, we get:

n=(\frac{1.645 \times 30}{2} )^{2}\\\\ n = 608.9

This means, the minimum number of observations required is 609

6 0
3 years ago
What fraction is closer to 0.125<br><br> 1/2 , 1/4 , 1/8 , 1/10
S_A_V [24]
1\8 is actually 0.125 so I hope this helps  
5 0
3 years ago
What is the solution of 15=-4+z/3
lana [24]
15=-4+z/3

+4 +15 = +4 -4 +z/3
cancels the 4 on the right side

19 = z/3

3 x 19 = z/3 x 3
cancels 3 on the right side

I think the answer is z = 57
4 0
3 years ago
Read 2 more answers
If mZDEC = (12x - 3), mZBCE =
kati45 [8]

Answer:

Step-by-step explanation:

12x - 3 = 180 - (7x - 26) supplementary angles

19x = 209

   x = 11

m∠DEC = 12(11) - 3 = 129°

m∠BCE = 7(11) - 26 = 51°

M∠ADE = 129 - 72 = 57°  exterior angle rule

m∠EDB = 180 - 57 = 123° supplementary angles

m∠DBC = 57° corresponding angle to ADE

3 0
3 years ago
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