Use the graph of $f(x)$ shown below to find the following integrals.

(Click on the graph for a larger version.)

A. $\int_{-4}^0 f(x) dx =$

B. If the vertical red shaded area in the graph has area $A$, estimate: $\int_{-4}^{6} f(x) dx =$
(Your estimate may be written in terms of $A$.)