Suppose b is any integer. If b mod 12 = 5, then 7b mod 12

The result follows directly from properties of modular arithmetic:

That is,

means we can write for some integer . Then

and taken mod 12, the first term goes away, so

etc

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!

im guessing (23,14). hope this : )