12/3 + 4 7/9 the answer has to be a faction

1 2/3 You take the 3 denominator multiply by 1 and add 2. you should get 5/3

4 7/9 you take the 9 multiply it by 4 and add 7. you should get 43/9

Then you need to find the common denominator to 5/3 multiply 3/3. you should get 15/9.

Now you can add 15/9 and 43/9 which equals

58/9 as an improper fraction but if you wanted a mix number its 6 4/9

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!