Answer
See the picture.
Work Step by Step
$x=20$:
$ŷ=-55961.675+4314.374\times20-45.66\times20^2=12061.805$
$x=30$:
$ŷ=-55961.675+4314.374\times30-45.66\times30^2=32375.545$
$x=40$:
$ŷ=-55961.675+4314.374\times40-45.66\times40^2=43557.285$
$x=50$:
$ŷ=-55961.675+4314.374\times50-45.66\times50^2=45607.025$
$x=60$:
$ŷ=-55961.675+4314.374\times60-45.66\times60^2=38524.765$
$x=70$:
$ŷ=-55961.675+4314.374\times70-45.66\times70^2=22310.505$
