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kelseypichla
13.10.2020 •
Mathematics
11. Six times a certain number less 31 is the same as 10 subtracted from Ehree times the number. Write the equation and find the number.
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Ответ:
Step-by-step explanation:
x - a certain number
6x - - six times the number
6x-31 - six times the number less 31
3x - three times the number
3x-10 - 10 subtracted from three times the number
so the equation:
6x - 31 = 3x - 10
+31 +31
6x = 3x + 21
-3x - 3x
3x = 21
÷3 ÷3
x = 7
Check: 6•7-31=42-31=11; 3•7-10=21-10=11
Ответ:
It is a rational number.
Step-by-step explanation:
A rational number is a number that can be express as the ratio of two integers. A number that cannot be expressed that way is irrational.
-9.1234567123 is a rational number because the numbers have a pattern of repeating which is 1234567.
Therefore, this number is a rational number.
Hope it helped!