If a question asks you to find f(2), what does that mean?

What is f(6) for the function f(x)=3x-8

$f\left(x\right)=5x-12$ What is $f\left(-4\right)$

 $Given\ h\left(x\right)=x^2-4\ what\ is\ h\left(6\right)?$  

 $Given\ h\left(x\right)=3x^2-2x+8\ what\ is\ h\left(2\right)?$  

 $Given\ f\left(x\right)=2x-10\ for\ which\ value\ of\ x\ that\ f\left(x\right)=8?$  

What is the value of f(-5)?

What is f(5) for the function f?

f(x) = 2(x - 7)