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How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)