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Nuetrik [128]
3 years ago
11

Evan spent 20 hours doing homework last week. This week he spent 25 hours doing homework. He says that he spent 125% more time d

oing homework this week. Is he correct? Show your work to justify your decision
Mathematics
1 answer:
pogonyaev3 years ago
7 0

Answer:

He isn't correct. He spent 25% more time this week than the previous one.

Step-by-step explanation:

We will make proportion.

first week 20 hours  is 100%

second week 25 hours is x%

20 : 25 = 100 : x

When we multiply external and internal members we get:

20x =25 · 100 =>  x = 2500/20 = 125%

We conclude the following:

Evan spent 125% of the time in hours compared to the last week or Evan spent 25% more time this week than the previous one.

God with you!!!


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( Math ) Please explain how you got this answer! Please use substitution method!
disa [49]

Answer:

y = 1

x = -2

Step-by-step explanation:

During the substitution method, you are substituting one function into another. Because both functions are set equal to "x", you can make the functions equal each other. This allows you to 'get rid' of the "x" variable and simplify to find the value of "y".

5A) x = -2y

5B) x = 2 - 4y

-2y = 2 - 4y                     <----- Set both equations equal

2y = 2                             <----- Add 4y to both sides

y = 1                                <----- Divide both sides by 2

Now that you know what "y" equals, you can plug that value into the "y" variable into one of the equations. This will allow you to then simplify and find the answer for "x".

x = -2y                             <----- Equation 5A

x = -2(1)                           <----- Plug 1 into "y"

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5 0
2 years ago
Perform the indicated operation.<br> -3(-8)(-2)
seraphim [82]

Answer:

-48

Step-by-step explanation:

Multiply all numbers to get -48

6 0
3 years ago
These two lines are<br> Graphs of non-proportional relationship makes makes them nonproportional
Tpy6a [65]

9514 1404 393

Answer:

  C  They do not go through the origin

Step-by-step explanation:

The graph of a proportional relationship is a straight line with a y-intercept of 0. These lines do not go through the origin, so do not describe a proportional relationship.

5 0
3 years ago
Richard Anderson sells magazine subscriptions and receives a weekly
icang [17]
He sold 19 subscriptions
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3 years ago
A study of women’s weights found that a randomly selected sample of 234 women had a mean weight of 157.3 lb. Assuming that the p
Scilla [17]

Answer:

157.3-1.96\frac{15.6}{\sqrt{234}}=155.301    

157.3+1.96\frac{15.6}{\sqrt{234}}=159.299    

So on this case the 95% confidence interval would be given by (155.301;159.299)    

And the best option would be:

B. (155.3, 159,3)

Step-by-step explanation:

Information given

\bar X=157.3 represent the sample mean

\mu population mean (variable of interest)

\sigma =15.6 represent the population standard deviation

n=234 represent the sample size  

Confidence interval

The confidence interval for the mean is given by the following formula:

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

The Confidence level is is 0.95 or 95%, the significance is \alpha=0.05 and \alpha/2 =0.025, the critical value for this case would be z_{\alpha/2}=1.96

And replacing we got:

157.3-1.96\frac{15.6}{\sqrt{234}}=155.301    

157.3+1.96\frac{15.6}{\sqrt{234}}=159.299    

So on this case the 95% confidence interval would be given by (155.301;159.299)    

And the best option would be:

B. (155.3, 159,3)

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4 years ago
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