The function `b(n)=6n` represent the number of bulbs`b(n)` that are needed for `n` chandeliers. How many light bulbs are needed for 15 chandeliers?
To find out how many light bulbs are needed for 15 chandeliers, we can substitute `n=15` into the equation `b(n)=6n` and solve for `b(15)`:
`b(15) = 6 * 15 = 90`
Therefore, 90 light bulbs are needed for 15 chandeliers.