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Akimi4 [234]
4 years ago
10

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:

  • brainly.com/question/1464739
  • brainly.com/question/2568692
  • brainly.com/question/10771256

#learnwithBrainly

6 0
4 years ago
Read 2 more answers
Fine the value of X
makvit [3.9K]

Answer:

30

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
Read 2 more answers
14 less then 3 times a number is 31 written out and solved
Jlenok [28]

Answer:

15

Step-by-step explanation:

3x-14=31

3x=45

x=15

3 0
3 years ago
Read 2 more answers
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
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