9514 1404 393
Answer:
x = 5
Step-by-step explanation:
The left-side bottom edge is marked as 30. The total bottom edge is marked as 45, so the right side length will be ...
45 -30 = 15
The top (slanted) edge marked 10 is 1/3 the length of the corresponding bottom edge (30). Then x will be 1/3 of 15, or ...
x = 5
_____
If you like, you can write a proportion:
total/long part = (10+x)/10 = 45/30
30(10+x) = 45(10)
10+x = 15 . . . . divide by 30
x = 5 . . . . . . . . subtract 10
