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Vilka [71]
3 years ago
10

The sum of two numbers is 30 & their difference is 12.

Mathematics
2 answers:
nika2105 [10]3 years ago
7 0
X+y=30
x-y=12
add them together

x+y=30
<u>x-y=12+</u>
2x+0y=42

2x=42
divide 2
x=21

subsitute
x+y=30
21+y=30
subtrat 21
y=9


number sare 21 and 9
podryga [215]3 years ago
6 0
The answer is 21 and 9. You can use guess and check to solve this. If you add 21 and 9, the sum is 30, and if you subtract 9 from 21, the difference is 12. 
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Answer: 0.999986176

Step-by-step explanation:

To solve this, the probability distribution formula for selection will be used

Where P(x=r) = nCr * p^r * q^n-r

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