Answer:
if x = 2
f(x) = -3x^2 + 180x -285
f(x) = -3*2*2 + 180*2 -285
f(x) = -12 + 360 -285
f (x) = 63
Step-by-step explanation:
$57
15 days
Don't you mean 1/3? If so,
5 cans
-------------------- = 15 days
1/3 can/daily