Answer:
BC = 35in.
Explanation:
AD says the entire line is 53in.
AB says it is equal to CD.
CD says it equals 9in so AB + CD = 18in.
BC says it equals 5x.
AB+BC+CD = AD
(9) + (5x) + (9) = 53
5x + 18 = 53
Subtract 18 from both sides
5x = 35
We can stop here because we know that BC = 5x and 5x = 35in.