The problem requires us to evaluate the expression $\frac{1.68}{1.5^2 - 1.45}$. We need to first calculate $1.5^2$, then subtract $1.45$ from the result, and finally divide $1.68$ by the result.

1. Problem Description

The problem requires us to evaluate the expression $\frac{1.68}{1.5^2 - 1.45}$. We need to first calculate $1.5^2$, then subtract $1.45$ from the result, and finally divide $1.68$ by the result.

2. Solution Steps

First, calculate $1.5^2$.

$1.5^2 = 1.5 \times 1.5 = 2.25$

Next, subtract $1.45$ from $2.25$.

$2.25 - 1.45 = 0.8$

Finally, divide $1.68$ by $0.8$.

$\frac{1.68}{0.8} = \frac{16.8}{8} = \frac{8.4}{4} = \frac{4.2}{2} = 2.1$

3. Final Answer

2.1