All categories

3 years ago

-2√7 rational or irrational?

Mathematics

2 answers:

IgorLugansk [536]3 years ago

3 0

The sqrt(7) part makes it irrational, so the answer is irrational.

Pani-rosa [81]3 years ago

3 0

Answer

$-2\sqrt 7$ $\text {is an irrational number}$

Explanation

$-2\sqrt 7$ is an irrational number, an irrational number is a number that contains repeating decimals or that cannot be written as a simple fraction.

You might be interested in

Please help me with this problem Evaluate (-½·3)³

-Dominant- [34]

Answer: -27/8

Step-by-step explanation:

$\left(-\frac{1}{2}\cdot \:3\right)^3$

$\mathrm{Apply\:exponent\:rule}:\quad \left(-a\right)^n=-a^n,\:\quad \mathrm{if\:}n\mathrm{\:is\:odd}$

$\left(-\frac{1}{2}\cdot \:3\right)^3=-\left(\frac{1}{2}\cdot \:3\right)^3$

$=-\left(\frac{1}{2}\cdot \:3\right)^3$

$\mathrm{Apply\:exponent\:rule}:\quad \left(a\cdot \:b\right)^n=a^nb^n$

$\left(\frac{1}{2}\cdot \:3\right)^3=\left(\frac{1}{2}\right)^3\cdot \:3^3$

$=-\left(\frac{1}{2}\right)^3\cdot \:3^3$

$=-\frac{1}{8}\cdot \:3^3$

$=-\frac{1}{8}\cdot \:27$

$=-\frac{27}{8}$

3 0

2 years ago

Write an equivalent expression for the following

Llana [10]

Answer:

6x, 2x + 4, 5y + 11

Step-by-step explanation:

x + x + x + 2x + x = 6x

(x + 2) + (x + 2) = 2x + 4

y + y + y + y + 10 + y + 1 = 5y + 11

6 0

3 years ago

A triangle has side lengths 8, 11, and 13. Is it a right triangle?

amid [387]

Answer:

It is not a right triangle. It is an obtuse triangle.

Step-by-step explanation:

6 0

3 years ago

Presence of the activity in this illustration is an example of how a country’s government can be shaped by

katen-ka-za [31]

Answer:

c or d but i think d

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

How to write 168.7 in expanded form

nadya68 [22]

Answer:

100 + 60 + 8 + 0.7

Step-by-step explanation:

Expanded form or expanded notation is a way of writing numbers to see the value of individual digits.

3 0

3 years ago

Read 2 more answers