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2 years ago

Find the sum of the first 30 terms of the sequence. a_(n)=4n+1

1 answer:

7 0

We know that
a(n)=4n+1
To find the sum of the first n terms of an arithmetic series
use the formula
Sn=n(a1 + an)/2
a1--------------> is the first term
an--------------> is the last term
n--------------- > is the number of terms
we have that
a1------------> 4*(1)+1=5
a30----------> 4*(30)+1=121
n------------- > 30
S30=30*(5 + 121)/2=1890

the answer is 1890

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If √2 = 1.414 then find the value of (√50+√72) please solve

Rus_ich [418]

Given:

$\sqrt{2}=1.414$

To find:

The value of $\sqrt{50}+\sqrt{72}$ .

Solution:

We have,

$\sqrt{50}+\sqrt{72}$

It can be rewritten as

$=\sqrt{2\times 25}+\sqrt{2\times 36}$

$=\sqrt{2}\times \sqrt{25}+\sqrt{2}\times \sqrt{36}$ $[\because \sqrt{ab}=\sqrt{a}\sqrt{b}]$

$=5\sqrt{2}+6\sqrt{2}$

$=11\sqrt{2}$

Putting $\sqrt{2}=1.414$ , we get

$=11(1.414)$

$=15.554$

Therefore, the value of given expression is 15.554.

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Natasha_Volkova [10]

Answer:

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Step-by-step explanation:

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2 years ago

Translate the algebraic expression and simplify if possible.

tamaranim1 [39]

-2/(a+b)
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2 years ago

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1 year ago

Express 9.25. as a fraction in its simplest form

Olenka [21]

Answer:

9 1/4

Step-by-step explanation:

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2 years ago