Answer:
x = 30
Step-by-step explanation:
m<A = 60°
m<D = 60°
...
ΔABC = ΔDEF
Therefore, ΔA and ΔD are equal.
...
m<A = x + 30
m<D = 2x
...
Think to yourself, "What can I multiply to 2 that will make it equal when added to 30?"
...
2(30) = 60°
(30) + 30 = 60°
...
Solution:
x = 30
Hope this helps!