Answer:
18
Step-by-step explanation:
.5 is 5 4 and below round down 5 and up round up
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If an angle is 70 degrees and there is an angle vertical to it, then that other angle also equals 70 degrees. Therefore, if angle X equals 40 degrees, then angle Y also equals 40 degrees. Hope this helps.
D. there is a perfect association between the variables