Answer:
6
Step-by-step explanation:
Given that f(3), x=3.
Since f(x) = 2x, we plug in 3 for x, and get 2 times 3. Therefore, the answer comes out to 6.
When f(3)
Then we have:
3=2x
Now we divide by 2 (on both sides)
and are left with
x = 1.5
Hope this helps :)