The noise level of an ambulance siren is 10 decibels louder than that of a car horn. If d represents

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The noise level of an ambulance siren is 10 decibels louder than that of a car horn. If d represents the noise level, in decibels, of a car horn, express the noise level of an ambulance siren in terms of the noise level of a car horn.

Let s be the level of the ambulance siren.
s = d + 10