$$.14 p \div .4 p$$
$\frac{7p^{2}}{20}$
$$0.35pp$$
$$0.35p^{2}$$
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$\frac{7p}{10}$
$$\frac{\mathrm{d}}{\mathrm{d}p}(0.35pp)$$
$$\frac{\mathrm{d}}{\mathrm{d}p}(0.35p^{2})$$
$$2\times 0.35p^{2-1}$$
$$0.7p^{2-1}$$
$$0.7p^{1}$$
$$0.7p$$