This is a strange question, and f(x) may not even exist. Why do I say that? Well..
[1] We know that f(a+b) = f(a) + f(b). Therefore, f(0+0) = f(0) + f(0). In other words, f(0) = f(0) + f(0). Subtracting, we see, f(0) - f(0) = f(0) or 0 = f(0).
[2] So, what's the problem? We found the answer, f(0) = 0, right? Maybe, but the second rule says that f(x) is always positive. However, f(0) = 0 is not positive!
Since there is a contradiction, we must either conclude that the single value f(0) does not exist, or that the entire function f(x) does not exist.
To fix this, we could instead say that "f(x) is always nonnegative" and then we would be safe.
        
             
        
        
        
See the attached figure
we know that
[<span>the area of the trapezoid]=[area rectangle]+2*[area triangle]
</span>[the area of the trapezoid]=[14*12]+2*[12*2/2]=192 in²
the answer is 192 in²
 
        
        
        
There is a 50% chance.
Explanation:
There is always a 50-50 chance that the coin will land on either heads or tails.
        
             
        
        
        
That's a quarter of the circle. So find the area of the circle, and divide by 4 to get the answer. 
Circle area = 3.14*13^2 = 530.66
Answer = circle area / 4 = 132.665
        
                    
             
        
        
        
Excellent 43.0000
Answer 8747744748848833773737374758