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anyanavicka [17]
3 years ago
8

Which number produces an irrational number when multiplied by 0.4

Mathematics
2 answers:
vovikov84 [41]3 years ago
3 0
Assuming 0.4 is in fact, 2 divided by 5 (and not an approximation of some number that would require an infinite amount of decimal places to exactly express), then multiplication by 0.4 is the same as multiplying by 2 and dividing by 5.

This means that multiplying any rational number by 2/5 will yield another rational number (as given x/y as an input, where x and y are integers, and multiplying it by 2/5 giving 2x/5y, will mean that 2x and 5y are also integers, and the result is also rational)

If we multiply an irrational number by 2/5, however, the result will be irrational.

So your answer is any number not in the set of rational numbers, multiplied by 0.4, will yield an irrational number.

kakasveta [241]3 years ago
3 0
Irrational number is a number without a perfect square root.

=2,3,5,6,7,8
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Ali's solution is incorrect.

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Step-by-step explanation:

Ali simplifies the expression 9y+y to 9y2. We need to identify if Ali's solution is correct or incorrect.

Ali's solution is incorrect.

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We are given the expression: 9y+y

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Whereas Ali has done multiplication of both terms and not addition.

In multiplication we add the exponents of the same variables i.e 9y+y = 9y^2

So, Ali had to add both the terms and should get 10y answer, and not multiply both terms and get answer 9y^2 which is wrong.

Keywords: Solving expressions

Learn more about Solving expressions at:

  • brainly.com/question/11207748
  • brainly.com/question/1600376
  • brainly.com/question/2456302

#learnwithBrainly

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