## Algebra 1: Common Core (15th Edition)

The table is not linear because the Y-value does not increase constantly. Using ratios, determine if it's quadratic: $1.5-0=1.5$ $6-1.5=4.5$ $13.5-6=7.5$ $24-13.5=10.5$ $10.5-7.5=3$ $7.5-4.5=3$ $4.5-1.5=3$ The constant ratio is $3$ so this is quadratic.