Answer
a.) $T=25,004$
b.) $139$
Work Step by Step
a.) Given $T=26x^2+819x+15,527$ and $x=9$, substituting $x$ we have:
$T=26\times(9)^2+819\times 9+15,527$
$T=26\times 81+819\times 9+15,527$
$T=2,106+7,371+15,527$
$T=25,004$
b.) $25,143-25,004=y$
$25,143-25,004=139$
