Put 15 where n is, then do the arithmetic.
b(n) = 6n . . . . . . . . . . . the formula for the number of bulbs for n chandeliers
b(15) = 6·15 = 90
The appropriate choice is ...
... 90 light bulbs
Substitute n=15 into the function because n is the number of chandeliers. You will get 90, which is the correct answer.
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