Answer:
1.5 cm
Explanation:
Triangles WTY and UTV are similar. Segment WT corresponds to UT and segment YT corresponds to VT. Thus we can create an equation knowing that the ratio of WT to UT must equal to the ratio of YT to VT.
WT = 7.5 cm
UT = ?
YT = 15 cm
VT = 12 cm
WT / UT = YT / VT
7.5 / UT = 15 / 12
UT = 6
WT = WU + UT
7.5 = WU + 6
WU = 1.5