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elena55 [62]
3 years ago
7

Me ajudem com a 3º questão

Mathematics
1 answer:
Alisiya [41]3 years ago
7 0

I can't read that language but I'll guess it says write a second degree equation then solve for n when d=10.

10 = \dfrac{n(n-3)}{2}

20 = n^2 - 3n

n^2 - 3n - 20 = 0

Answer: n² - 3n - 20 = 0

That doesn't factor so there is no integer n solution.

That means there are no polygons with 10 diagonals.

n = \frac 1 2(3 \pm \sqrt{89})

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dmitriy555 [2]

Answer:

a) (\sqrt[n]{x}) the n will be 5 the x will be (-32/243)^2.

b) written the same as a. except the c will replace the n and x will be (2y)^b.

c) the answer will be 0.4^3.

d) the answer would be (st)^v/u.

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3 years ago
Select all of the expressions that are equivalent<br> to 18x+6.
Levart [38]

Answer:

6(3x+1)

To check

6×3x=18x

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8 0
3 years ago
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5. Choose the correct answer.
zepelin [54]

Answer:

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Step-by-step explanation:

For example: the price of the shirt was $10.00 It had a markdown of 15%. This would be $8.5.

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2 years ago
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Find the square root of 201.64 by division method
Juli2301 [7.4K]

Steps involved in finding square root using division method:

  1. Group the digits of the number in pairs. You will start pairing from the decimal point and move away from the decimal point. E.g. for 201.64, first pair would be 2, second would be 01, and third would be 64 (see the attachment for visualizing)
  2. Now start with the first pair, and find the number whose square is equal to or just less than the first pair. So here, since first pair is 2, that number whose square is just less than or equal to 2 is 1. Now divide 2 by 1 , and also put 1 in the quotient.
  3. After this step, you will have 1 in quotient, and 1 in divisor with remainder of 2 - 1 = 1. Now bring down the next pair to join with the remainder. The resulting number now is 101
  4. Now, double the number that is there in the quotient (so 1 becomes 2) and use it to determine the new divisor for 101. The new divisor will be such that when the divisor is multiplied with its unit digit then the product is just less than or equal to 101 (i.e. 2x * x <= 101). So for x = 4, 24 *4 = 96, which is less than 101. Now append this 4 in the quotient. The quotient now become 14. And subtract 96 from 101 to find the remainder. The remainder now is 5
  5. We have now reached the decimal point in the dividend, so add a decimal point in the quotient
  6. Now bring down the next pair to join with the remainder. The resulting number now is 564
  7. Now, double the number that is there in the quotient (so 14 becomes 28) and use it to determine the new divisor for 564. The new divisor will be such that when the divisor is multiplied with its unit digit then the product is just less than or equal to 564 (i.e. 28x * x <= 564). So for x = 2, 282 *2 = 564. Now append this 2 in the quotient. The quotient now become 14.2. And subtract 564 from 564 to find the remainder. The remainder now is 0. Hence, we have completed the problem, and we have the square root with us
  8. The square root is the quotient obtained: 14.2

Please refer to the attached image to see how the calculations are done

5 0
3 years ago
Help , this is a big grade.
jolli1 [7]

Answer:

-8

Step-by-step explanation:

looked it up on the internet

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