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Since the tax on the room is given by the function:
T(x)=0.06x+45
And x(cost in dollars of the room) is given= $120, you just have to subtitue x=120 on the function
T(120)=0.06(120)+4.5
T(120)=7.2+4.5
T(120)=11.7
So, the tax in dollars would be $11.7