How to find complex conjugates in math

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Find the conjugate of
$\blacksquare \;$ $■$ $3+4i$ $3 + 4 i$
$\blacksquare \;$ $■$ $4-\sqrt6i$ $4 - 6 i$
$\blacksquare \;$ $■$ $-\sqrt{10}+4i$ $- 10 + 4 i$
$\blacksquare \;$ $■$ $i-5$ $i - 5$
Given that $z=5+6i$ $z = 5 + 6 i$ , determine $\overline{z}+\overline{z}$ $\overline{z} + \overline{z}$
Given that $w=i-14$ $w = i - 14$ , determine $\overline{w}+w$ $\overline{w} + w$
If $z=15+2i$ $z = 15 + 2 i$ , $w=28i-7$ $w = 28 i - 7$ , determine $w+\overline{z}$ $w + \overline{z}$

Complex conjugates