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FromTheMoon [43]
4 years ago
15

Is -7.8 an irrational number

Mathematics
2 answers:
topjm [15]4 years ago
6 0

Answer:

No.

Step-by-step explanation:

An irrational number has never-ending decimals.

A rational number can be written as a fraction or has a terminating decimal.

-7.8 can be rewritten into a fraction. Its decimal also terminates. Therefore, it is not irrational but rational.

pshichka [43]4 years ago
6 0

Answer:

-7.8 is rational

Step-by-step explanation:

irrational numbers are nubers that repaet random numbers that you wont know what comes next like pi or the squar root of 2. hope this halps and can you take in consideration of giving me a brainliest?  Thank you

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Step-by-step explanation:

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3 years ago
Help me plz how many times you can make it
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4 years ago
How would you do number 12 and 15?
Gnesinka [82]

Answer:

x_1=x_2=-\dfrac{2}{3}

Step-by-step explanation:

For the quadratic equation ax^2+bx+c=0 the discriminant is defined as

D=b^2-4ac

and the quadratic formula for the roots gives us two roots:

x_1=\dfrac{-b-\sqrt{D}}{2a}

and

x_2=\dfrac{-b+\sqrt{D}}{2a}

For the equation 9x^2 +12x+4=0 use quadratic formula to find roots:

D=12^2-4\cdot 9\cdot 4=144-144=0

So,

x_1=x_2=\dfrac{-12\pm \sqrt{0}}{2\cdot 9}=-\dfrac{12}{18}=-\dfrac{2}{3}

7 0
4 years ago
1. 2 (x-3) = 9+ 3 (x-9)
bazaltina [42]

Answer:

x = 12

Step-by-step explanation:

Given

2(x - 3) = 9 + 3(x - 9) ← distribute parenthesis on both sides

2x - 6 = 9 + 3x - 27, that is

2x - 6 = 3x - 18 ( subtract 3x from both sides )

- x - 6 = - 18 ( add 6 to both sides )

- x = - 12 ( multiply both sides by - 1 ), thus

x = 12

3 0
3 years ago
Read 2 more answers
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