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ahrayia [7]
3 years ago
5

The sum of a rational number and an even integer is rational. A) Always True B) Sometimes True C) Usually True D) Never True

Mathematics
1 answer:
SOVA2 [1]3 years ago
6 0
I think that the sum will always be a rational number
let's prove that


<span>any rational number can be represented as a/b where a and b are integers and b≠0

</span>and an integer is the counting numbers plus their negatives and 0
so like -4,-3,-2,-1,0,1,2,3,4....

<span>so, 2 rational numbers can be represented as

</span>a/b and c/d (where a,b,c,d are all integers and b≠0 and d≠0)

their sum is
a/b+c/d=
ad/bd+bc/bd=
(ad+bc)/bd

1. the numerator and denominator will be integers
2. that the denominator does not equal 0

alright
1.
we started with that they are all integers
ab+bc=?
if we multiply any 2 integers, we get an integer
<span>like 3*4=12 or -3*4=-12 or -3*-4=12, etc.
</span>even 0*4=0, that's an integer
the sum of any 2 integers is an integer
like 4+3=7, 3+(-4)=-1, 3+0=3, etc.
so we have established that the numerator is an integer

now the denominator
that is just a product of 2 integers so it is an integer


<span>2. we originally defined that b≠0 and d≠0 so we're good

</span>therefore, the sum of any 2 rational numbers will always be a rational number <span>is the correct answer.</span>
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A=4,b=-2,C=5 d=-6 , e =-1 5 ed-3cb +4ba-2ea​
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2 years ago
Two numbers are in the ratio 3:5. If one of them is greater than the other by 10,Find the smaller number.​
alisha [4.7K]

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Read 2 more answers
X + 2(y-6) = 0
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3. x = 2+ 1/2z | for z , z = -4 + 2x
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6. x = -5w + 13 | w = -1/5x + 13/5
5 0
2 years ago
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