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A searchlight uses a parabolic mirror to cast a beam of light in parallel rays...

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A searchlight uses a parabolic mirror to cast a beam of light in parallel rays where the light bulb is located at the focus of the parabola in order to give the best illumination. The mirror is modeled by y = 20(x - 10), where the measurements are in cm. What is the location of the light bulb?(10,0)(20, 0)(12, 0)(15, 0)

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