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kvasek [131]
4 years ago
10

A rectangular flower bed is enlarged so that its area increases by 14 m². The enlarged flower bed is a rectangle and its area is

x2+9x+14 m².
What expressions represent the dimensions of the flower bed before the increase?

Enter your answers in the boxes.


[ ] m and [ ] m
Mathematics
1 answer:
Effectus [21]4 years ago
8 0

Answer: Dimensions of the flower bed before the increase are x meters  and x+9 meters.

Step-by-step explanation:

Since we have given that

A rectangular flower bed is enlarged so, its area increases by 14 m².

So, Enlarged area of flower bed = x^2+9x+14

We need to find the dimensions of the flower bed before the increase.

so, Let the original area be 'A'

so, it can be written as :

A+14=x^2+9x+14\\\\A=x^2+9x\\\\A=x(x+9)

Since we know the area of rectangular flower bed is Length × Breadth

So, Dimensions of the flower bed before the increase are x meters  and x+9 meters.

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Researchers at a pharmaceutical company have found that the effective time duration of a safe dosage of pain relief drug is norm
FrozenT [24]

Answer:

a) P(1

b) P(X

Step-by-step explanation:

1) Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

2) Part a

Let X the random variable that represent the duration of a safe dosage of pain relief drug, and for this case we know the distribution for X is given by:

X \sim N(1.5,0.8)  

Where \mu=1.5 and \sigma=0.8

We are interested on this probability

P(1

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(1

And we can find this probability on this way:

P(-0.625

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(-0.625

3) Part b

We are interested on this probability

P(X

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(X

And we can find this probability on this way:

P(z

6 0
3 years ago
Answer this question, real quick
zysi [14]

A flaw is something that makes the person no longer perfect. We all have flaws. A isn't a flaw and neither is B or D. So, your answer is C.

8 0
4 years ago
Read 2 more answers
Need help on 11,12,13,14,15
const2013 [10]

Not sure what 14 is asking?

15 would be 16.

The square root of width squared plus length squared equals the diagonal.

So if you just change the order of the equation you can find the length.

Double check it by doing it both ways to see if your answer is right.

7 0
3 years ago
When downloading a large file from the internet Alice interrupted the download by closing her computer. Later that evening she r
Temka [501]

Using the slope concept, it is found that the rate of download of the file is of 1920 MB/s.

<h3>What is the slope?</h3>

The slope of a linear function is given by the <u>change in the output divided by the change in the input</u>.

In this problem:

  • 3 minutes since resuming the download 6720 total MegaBytes (MB).
  • 5 minutes since resuming the download 10560 total MegaBytes (MB) of the file had been downloaded..
  • Hence, in 2 minutes, there was a change of 10560 - 6720 = 3840 MB, which means that the slope is:

m  = \frac{3840}{2} = 1920

The rate of download of the file is of 1920 MB/s.

You can learn more about the slope concept at brainly.com/question/25934562

8 0
3 years ago
Simplify the expression -2 (x + 4 + 5y).
dezoksy [38]

Answer:

-2x-10y-8

Step-by-step explanation:

Rearange terms

-2(x+4+5y)

-2(x+5y+4)

Distribute

5 0
3 years ago
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