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3 years ago

I need help! I don't really understand.... Can someone help for these 2 questions?? Part A and B??

Mathematics

1 answer:

vfiekz [6]3 years ago

8 0

Answer:

A. 6x + 4

B. 22 cm

Step-by-step explanation:

The perimeter of the triangle is equal to the sum of all the side lengths, which is (2x+3) + (x+1) + (3x), or 6x + 4.

When x = 3cm, the perimeter is 6(3) + 4, which is 22 cm.

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Math help 30 points

mash [69]

Again here we're using like terms

a) -2x² + 12x² = 10x² (they have the same term that's why I grouped them together)

-4x + 2x = -2x

13 - 25 = -12

So the final answer is 10x² - 2x -12

b) 7x² - (-7x²) = 7x² + 7x² or 14x²

4x - (-3x) = 4x + 3x or 7x

-26 - 15 = -41

The final answer to this one is 14x² + 7x - 41

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3 years ago

Please help.. I got stuck on this question please help and explain

Inessa [10]

Jay is wrong about his claim

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3 years ago

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How to solve this problem?

valentinak56 [21]

Very nice handwriting but the math and English are confusing.

Let's assume we're told

$\displaystyle 45 = \sum_{i=1}^9 (x_i - 10)^2$

The subscript is important.

I think we're told the similar sum with 11 gives the smallest possible value for the sum. This is a rather cagey way of telling us 11 is the mean of the nine points. The mean is the number which minimizes the sum of squared deviations.

$\displaystyle 45 = \sum_{i=1}^9 (x_i - 10)^2 = \sum x_i^2 - 20 \sum x_i + 9(100)$

$\displaystyle \sum x_i^2= 20 \sum x_i - 900$

If 11 is the mean, the sum of the points is 9(11)=99.

$\displaystyle \sum x_i^2= 20 (99) - 900 = 1080$

Answer: 1080

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3 years ago

When 5,708,100,000 is written in scientific notation, the decimal number will be multiplied by the ninth power of 10.

Anuta_ua [19.1K]

Answer: True

Step-by-step explanation: 5,708,100,000 in scientific notation is 5.7081 × 10^9

Hope this is right and makes sense.... I'm really sorry if it is wrong

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DochEvi [55]

Answer:

Step-by-step explanation:

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