$$2k+k-\frac{1}{4}k=$$
$\frac{11k}{4}$
$$3k-\frac{1}{4}k$$
$$\frac{11}{4}k$$
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$\frac{11}{4} = 2\frac{3}{4} = 2.75$
$$\frac{\mathrm{d}}{\mathrm{d}k}(3k-\frac{1}{4}k)$$
$$\frac{\mathrm{d}}{\mathrm{d}k}(\frac{11}{4}k)$$
$$\frac{11}{4}k^{1-1}$$
$$\frac{11}{4}k^{0}$$
$$\frac{11}{4}\times 1$$
$$\frac{11}{4}$$
