I'm taking the same math finals right now.
The correct answer is: f(1/2) = 14/3
How? Well let's substitute the x (which is 1/2) into the equation.
We get f(1/2) = -2/3(1/2) + 5
Now we solve it.
f(1/2) = -2/3(1/2) + 5
= -2/6 + 5
= -2/6 + 30/6
= 28/6
= 14/3
The answer we get is
f(1/2) = 14/3
