Question

d= the square root of 4h/5 make h the subject of the formula

Answer 1

$d = \sqrt{ \frac{4h}{5} } \\ square \: both \: sides \\ d {}^{2} = \frac{4h}{5} \\ multiply \: both \: sides \: by \: 5 \\ 5d {}^{2} = 4h \\ divide \: both \: sides \: by \: 4$

$h = \frac{5d {}^{2} }{4}$