First blank: Substitution or transitive property of equality
Second blank: Subtraction property of equality
Answer:
M=9
Step-by-step explanation:
Combine the like terms and wallah you solved it
c^2=a^2+b^2
c^2 = 12^2 + 5^2
C^2 = 144 +25
C^2 = 169
c=13
DF = 13