D 5
Reason
1.
2.
Given: 21:23
Prove: 22 and 23 are supplementary
Statement
1. 21:23
2. mZ1 = m23
3. Z1 and 22 form a linear pair
4. 21 and 22 are supplementary
5. m21+m22 = 180°
6. mZ3+ m2 = 180°
7. 22 and 23 are supplementary
3
4.
5.
6.
7.
A. given
B. substitution property of equality
C. linear pair postulate
D. definition of a linear pair
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not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

answer: i don't understand it

step-by-step explanation: sorry

where did you get them? if you picked from the grass, is is probably poisonous.

step-by-step explanation: