contestada

What is the range of f(x) = 3x?
A.All positive real numbers
B.All real numbers greater than 3
C.All real numbers
D.All real numbers greater than or equal to 3

Respuesta :

we can replace x by any real number  
so the range is also all real numbers

C
SmartChick
The answer is C : All real numbers. This means that y values can go up forever and down forever. Any linear graph has this quality.
A is wrong because the graph won't suddenly stop before going below the x axis
B is wrong because the slope is 3 which has no affects on the range
D is wrong for the same reason as b

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