Step-by-step explanation:

In a survey over whom prefers orange juice and whom prefers milk, 7 kids said they liked orange juice, and 5 chose milk.
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Answer:
D(9, 1)
Step-by-step explanation:
A being the midpoint means its coordinates satisfy ...
A = (E + D)/2
Solving for D, we find ...
D = 2A -E
= 2(4, 5) -(-1, 9) = (2·4 +1, 2·5 -9)
D = (9, 1)
Answer:
7
Step-by-step explanation: