Answer:
18
Step-by-step explanation:
by similarity, A corresponds to R, B to T, C to S
we know this bc all 3 angles are the same, so AAA similarity
looking at BC and TS, TS is 4/3 times the length of BC
BC is 3/4 times the length of TS
since the triangles are similar, this ratio applies to all lengths
so SR, which is the corresponding length to AC, is 24, so AC = 24 * 3/4 = 18
