Answer:
The right answer is "5.9". A further solving is provided below.
Step-by-step explanation:
The given values are:
Initial Magnitude,
M₁ = 3.9
Let Second magnitude be M₂.
Now,
⇒  
On substituting the values, we get
⇒  
On putting the value of "log 120", we get
⇒  
On adding "3.9" both sides, we get
⇒  
⇒                    
 
        
             
        
        
        
Make all a and constant number in different side 
10-7=16z-7z+2z
3=11z
z=3/11
        
                    
             
        
        
        
Answer: The missing statements are,
In first blank:  ∠2≅∠1 
In second blank:  AC≅AC
In third blank:  Reflexive
Step-by-step explanation:
Since, The hypotenuse angle theorem states that if the hypotenuse and an acute angle of one right triangle are congruent to the hypotenuse and an acute angle of another right triangle, then the two triangles are congruent to each other.
Here, given:
∠D and ∠B are right angles.
DC ║ AB
Prove: Δ ADC ≅ Δ CBA
               Statement                                       Reason
1.∠D and ∠B are right angles       1. Given
2. ∠2 ≅ ∠1                                      2. If lines are parallel then interior angles 
                                                         are equal
3. AC≅AC                                       3. Reflexive 
4.Δ ADC ≅ Δ CBA                         4. Hypotenuse angle theorem