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3 years ago

Is 2.81 an irrational number

Mathematics

2 answers:

nekit [7.7K]3 years ago

5 0

Answer:

No.

Step-by-step explanation:

It can be written as 2 81/100 or 281/100 so it is not irrational. An irrational number is a number that cannot be written as a ratio of two numbers

Sergio039 [100]3 years ago

5 0

Answer:

no, 2.81 is a rational number.

Step-by-step explanation:

An irrational number is a number that cannot be expressed as a fraction for any integers and. . Irrational numbers have decimal expansions that neither terminate nor become periodic. Every transcendental number is irrational.

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murzikaleks [220]

Answer:

8/3

Step-by-step explanation:

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victus00 [196]

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Evaluate arithmetic series:- Step-by-step answer, please!

lorasvet [3.4K]

Let's see

$\\ \rm\Rrightarrow {\displaystyle{\sum^{275}_{k=1}}}(-5k+12)$

$\\ \rm\Rrightarrow (-5(1)+12)+(-5(2)+12)\dots (-5(275)+12)$

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$\\ \rm\Rrightarrow S_n=\dfrac{n}{2}[a+l]$

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2 years ago

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Evaluate 4x exponent 2+ 2x-1 for x=9

olasank [31]

The value of given expression is 341

Solution:

Given that we have to find the value of given expression

Given expression is:

$4x^2 + 2x - 1$

Given value is x = 9

Substitute x = 9 in given expression

$\rightarrow 4(9)^2+2(9) - 1$

Solve the above expression

$\rightarrow 4 \times (9 \times 9) + 18 -1\\\\\rightarrow 4 \times 81 + 17\\\\\text{Multiply the terms 4 and 81 }\\\\\rightarrow 324 + 17\\\\\text{Add the numbers }\\\\\rightarrow 341$

Thus the value of given expression is 341

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