The unknown number is 48 using the equation: x ÷ 12 +49=53 subtract 49 from both sides and get x ÷ 12 = 4 multiplying by 12 on both side to get rid of the ÷12 and get the final answer of x=48.
Answer:
SSS congruence theorem.
Step-by-step explanation:
We have proved that the 3 sides of the triangles are congruent.
X-6=36
x=42
Hope that helps