## Algebra 1

The given formula is $d=1.2\sqrt A$. We need to isolate $A$ in order to solve for it: Divide by 1.2 on both sides and then square each side: $(\frac{d}{1.2})^{2}=A$ Now, plug in 8 for $d$ and then repeat for $12$: $(\frac{8}{1.2})^{2}=44.44$ and $(\frac{12}{1.2})^{2}=100$ Subtract the area when $d=12$ by the area when $d=8$: $100-44.44=55.56$