The answer is 8/10 and that simplified is 4/5
ANSWER:
3
EXPLANTION:
21/7 is 3
FUN FACT:
People have been celebrating birthdays since 100 AD.
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F(x) = 3x + 2
f(x + 3) = 3(x+3) + 2
f(x+3) = 3x + 9 + 2
f(x+3) = 3x + 11 (Answer)
Yes.
It can be proved by contradiction.
Let:
a - a rational number
b - an irrational number
c - the sum of a and b

Let assume that c is a rational number. Then a and c can be expressed as fractions with integer numerator and denominator:

where


Since

are all integers, then the products

and the difference

are integers as well. It means that the number

is a rational number, but this on the other hand contradicts the earlier assumption that

is an irrational number. Therefore

must be an irrational number.