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4 years ago

Did I do the first one right ? And help On the second one

Mathematics

1 answer:

Juliette [100K]4 years ago

3 0

A)your answer is correct but you can also use the formular
Sum of interior angles=(2times number of sides -4)90
2times11 -4=18
18 times 90
=1620

B)if 11 sides=1620
1 side=?
1620/11
=147.27 degrees

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Complete the steps to factor 56x2 – 8x – 7x + 1 by grouping.

konstantin123 [22]

The factorization of the polynomial $56x^2-8x-7x+1$ is $(8x-1)(7x-1)$

Step-by-step explanation:

We need to Complete the steps to factor $56x^2-8x-7x+1$ by grouping.

After grouping:

$(56x^2-8x) + (-7x + 1)$

Factor the GCF from each group.

$8x(7x-1)-1(7x-1)\\$

Use the distributive property.

$(8x-1)(7x-1)$

So, the factorization of the polynomial $56x^2-8x-7x+1$ is $(8x-1)(7x-1)$

Keywords: factorization by grouping

Learn more about factorization by grouping at:

#learnwithBrainly

6 0

4 years ago

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Fine the value of X

makvit [3.9K]

Answer:

Step-by-step explanation:

60/40=3/2

105/40+x = 3/2

105/70=3/2

x=70-40 = 30

8 0

4 years ago

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14 less then 3 times a number is 31 written out and solved

Jlenok [28]

Answer:

Step-by-step explanation:

3x-14=31

3x=45

x=15

3 0

3 years ago

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A study found that out of 300 people 60% of them prefer to eat hamburgers rather than hot dogs. Find the 95% confidence interval

Lerok [7]

Answer:

(0.5446, 0.6554)

Step-by-step explanation:

As the sample is sufficiently large, the formula is used to estimate the proportion shown in the attached image.

Where:

P: sample proportion = 0.6

n: Sample size = 300

$1-\alpha$ : Confidence level = 0.95

α: Significance = 0.05

$Z_{\alpha / 2} = 1.96$ *

* Obtained from the normal standard table.

When introducing these values in the formula shown in the image we obtain:

$0.6 + 1.96 *\sqrt {\frac{0.6*0.4}{300}}$

$0.6 - 1.96 *\sqrt{\frac{0.6*0.4}{300}}$

Finally, the confidence interval is:

(0.5446, 0.6554)

8 0

3 years ago

Richard had 180 total minutes to do

zaharov [31]

3(x+4)= 3x+12
3x+12+x+3+x=5x + 15
5x+15=180
5x=180-15
5x=165
x=165/5
x= 33min

mowing the grass = 3(x+4)
= 3(33+4)
=99+12
=111 min mowing grass

3 0

3 years ago