15. *Cho hình bình hành ABCD, Ab là góc nhọn, AC cắt BD tại O, DE ⊥ AB tại E, DF ⊥ BC tại F.
(a) Chứng minh rằng tam giác FOE cân
(b) Giả sử BAD [ = m. Tính EOF [theo m.

i got 86 for this

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a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

mean, 40.6

step-by-step explanation: