The tables show how the dollar to euro conversion rate changed during one day. Khalil changed $500 into euros (£).
How many more euros did Khalil receive if he changed his money at the highest rate compared to the lowest rate?

the attachment is the table

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Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

Point a is at 12, and point d is at 56. point c is midway between a and d, and point b is midway between a and c. which of these is the coordinate of b?