x = 3a - 2·10 - 2a
x = 3a - 2a - 20
x = a - 20
Answer:
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y= x less than 1.5 +4.25
Step-by-step explanation:
81cm
15cm + 20cm + 21cm + 25cm = 81cm
y+x is greater than or equal to -1
Let assume that is a rational number. Therefore it can be expressed as a fraction where and .
This means that is divisible by 7, and therefore also is divisible by 7.
So, where
Analogically to ------- is divisible by 7 and therefore so is .
But if both numbers and are divisible by 7, then which contradicts our earlier assumption that .
Therefore is an irrational number.