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I am haveing troubles of where to star with this;countValues (lowRange: int, highRange: int); int
//counts and return the number of values that are >= lowRange and <= highRange
+isNumberFound(someNumber: int); bool
//if the array contains someNumber, return true, otherwise return false
In the first you simply iterate over X, test the condition with each value, and if condition holds, increase a counter. Counter starts at 0, and should hold the correct value, when the iteration is over.
In the second the test condition is simpler and you can abort the iteration, if it is true.
Third: display what?
All three functions seem to refer to something (X) that you did not tell us about.