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1. Kathryn Says:
   July 10th, 2008 at 9:42 am

   Well, I would say just graph the function on your graphing calculator and see what the answer is.

2. Random smart person Says:
   July 10th, 2008 at 9:42 am

   Not sure about the first one… But the domain would be all of the real numbers where -cos x is a real number.

   2) Domain= all real number Range= all positive numbers.

   3) Domain= all real numbers greater than or equal to -3 and less than 3. Range= all real numbers from 9 to 0 (including 9 and 0)

3. sv146683 Says:
   July 10th, 2008 at 9:42 am

   Sorry for my poor English:
   Domain: all possible values of x
   Range: all possible values of y

   1) Domain: all real numbers, since cos x is defined for alle real numbers. Range: [-1,1] since the cos function varies between -1 and 1
   2) Domain: all real numbers, since x^2 is defined for all real numbers. Range [1, inf) since x^2 is alway equal to or greater than 0
   3) Domain [-3,3]. Since sqrt is only defined for non-negative numbers. Range: [0,3]

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