Answer:
 -49
Explanation:
In order to fill in the given expression, we need to know ...
- f(-2) = -4
 - f(-3) = 5
 - f(-4) = 7
 - g(0) = -7
 - g(-3) = 3
 
Then the expression is ...
 √(5 -(-4)) -(-7)² +7÷(-7)·(3) = √9 -49 +7/(-7)(3)
 = 3 -49 +(-1)(3) = 3 -49 -3
 = -46 -3 = -49