Answer:
$2.85
Step-by-step explanation:
So you have the equation g = 0.15b and you have that the food bill is $19, which would mean b = 19.
Then, you just have to plug that into the equation which would look like this:
[tex]g = 0.15 * 19[/tex]
0.15 * 19 = $2.85, so the gratuity, or tip, is $2.85