535. If x = 1/2, then x^-1 + x^-2 + x^-3 + x^-4 =

536. Three years from now, Dathan will be three times as old as Ellen and Ellen will be six years younger than Famke. If Dathan's age is three years less than twice Famke's age, how old is Famke?

537. What is the value of b ?
(1) b - x = x - b
(2) b - x = 0

TOTAL

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