Try solving for the variable and get everything to one side
Answer:
n = 18
Step-by-step explanation:
Corresponding parts of similar triangles are in same ratio

Answer:
ITS C: 2/3 in.
Step-by-step explanation:
edg 21 ^u^
[c] 70°
40+2x=180
2x=140
x=70
i use 2x since the angle measures of D and C are equivalent since it is an isosceles