Answer
(a) $y = 0.0121x^2 - 0.4904x + 4.9657$
(b) see graph.
(c) $19.8s$
Work Step by Step
(a) Find the quadratic polynomial that best fits the data.
$y = 0.0121x^2 - 0.4904x + 4.9657$
(b) Draw a graph of the polynomial from part (a) together with a scatter plot of the data.
see graph.
(c) Use your graph from part (b) to estimate how long it takes for the tank to drain completely.
Set $y=0$, we can find the a lower $x=19.8s$
