$$- 36 y ^ { 3 } \div 9 y ^ { 2 }$$
$-4y^{5}$
$$-4y^{3}y^{2}$$
$$-4y^{5}$$
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$-20y^{4}$
$$\frac{\mathrm{d}}{\mathrm{d}y}(-4y^{3}y^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(-4y^{5})$$
$$5\left(-4\right)y^{5-1}$$
$$-20y^{5-1}$$
$$-20y^{4}$$
