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The function $\hat{h}$ is defined by $\hat{h}\left(x\right)=a^{x}+b$, where $\bar{a}$ and $\bar{b}$ are positive constants. The graph of $\hat{h}(x)$ in the $$xy$-plane$ passes through the points $(0,10)$ and $(-2,\ \frac{325}{36})$. What is the value of $ab$?