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Sonbull [250]
3 years ago
15

Will someone tell me if these are right or not

Mathematics
2 answers:
Marianna [84]3 years ago
8 0
Looks correct to me :)
chubhunter [2.5K]3 years ago
3 0
You are right. Hope this helps! :)
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Write the series using summation notation. Then find the sum of the series.
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Hello, please consider the following.

\displaystyle 1+2+3+...+12=\sum_{k=1}^{k=12} {k}=\dfrac{12*13}{2}=6*13=78

For the second we will need to put on the same denominator.

\displaystyle \dfrac{1}{2}+\dfrac{1}{4}+...+\dfrac{1}{14}=\sum_{k=1}^{k=7} {\dfrac{1}{2k}}\\\\=\dfrac{1}{2}\dfrac{420+210+140+105+84+70+60}{5*7*3*2*2}\\\\=\dfrac{1}{2}\dfrac{1089}{420}\\\\=\dfrac{1089}{840}=1.296429...

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3 years ago
Factor completely 2x2 9x 4. (2x 2)(x 2) (2x 1)(x 4) (2x 4)(x 1) (2x 2)(x 4).
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Factors of the given expression are (x+4), (2x+1)

Given expression is

2x^2 + 9x+4

<h3>What is a factor?</h3>

A factor is a number that divides another number completely.

Let us split the middle term as:

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Therefore, factors of the given expression are (x+4), (2x+1)

To get more about factors visit:

brainly.com/question/9781037

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X is equal to 8 and y is equal to 9

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Step-by-step explanation:

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