$$b.6^{4}\times6^{-3}\times6^{-1}$$
$\frac{b}{10000}$
$$b\times 0.6^{4}\times 6^{-4}$$
$$b\times 0.1296\times 6^{-4}$$
$$b\times 0.1296\times \frac{1}{1296}$$
$$b\times \frac{1}{10000}$$
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$0.0001$
$$\frac{\mathrm{d}}{\mathrm{d}b}(b\times 0.6^{4}\times 6^{-4})$$
$$\frac{\mathrm{d}}{\mathrm{d}b}(b\times 0.1296\times 6^{-4})$$
$$\frac{\mathrm{d}}{\mathrm{d}b}(b\times 0.1296\times \frac{1}{1296})$$
$$\frac{\mathrm{d}}{\mathrm{d}b}(b\times \frac{1}{10000})$$
$$\frac{1}{10000}b^{1-1}$$
$$\frac{1}{10000}b^{0}$$
$$\frac{1}{10000}\times 1$$
$$\frac{1}{10000}$$
