Answer:
You should know how to integrate both sides
Step-by-step explanation:

The answer for the completion exercise shown in the image attached above is:
1) Multilplication property of equality (If you multiply mEFG+mGDE=360° both sides of the equation by 1/2, you obtain 1/2(mEFG)+1/2(mGDE)=180°).
2) m∠D=1/2(mEFG)
3) m∠F=1/2(mGDE)
4) By the substitution property of equality (Because if you substitute m∠D=1/2(mEFG) and m∠F=1/2(mGDE) into 1/2(mEFG)+1/2(mGDE)=180°, you obtain: m∠D+m∠F=280°).
<span>The reflexive property of equality states that a value is equal to itself. (i.e. for all real numbers, x = x.</span>)
Given that the reason for the missing statement, it means that the similarlity statement is equal to it self.
Having proved in statement 3 that <span>∠AEC ≅ ∠BDC both being right angles, it can be seen that the angle both have in common is angle C.
Thus, to statement 4 shows that angle C is congrent to itself.
Therefore, the missing statement in step 4 is </span><span>∠ACE ≅ ∠ACE</span>
Answer:
b
Step-by-step explanation:
the answer is b if values are plugged in to function