Answer:
3
Step-by-step explanation:
This is a piece-wise function. The domain [x-values] is broken down into parts.
<em>To evaluate this type of functions, we see in </em><em>WHICH PART</em><em> of the </em><em>DOMAIN</em><em> does the questions ask to look for.</em>
The question asks for
, the value of the function at
<em>In which of the 3 parts does
fall into?</em>
The domain condition,
, in the last part tells us that it is GREATER THAN OR EQUAL TO 3. So
falls in this part of the function, which is 
We can simply substitute 3 in
of that part and get our desired answer. So,

The value of 