Question

$25 ^{ -frac{1}{2} } + ( frac{5}{2} ) ^{-1}$

Answer 1

$25 ^{- frac{1}{2} }= frac{1}{25 ^{ frac{1}{2} } }= frac{1}{ sqrt{25} } = frac{1}{5}$
$(frac{5}{2}) ^{-1}= frac{2}{5}$
$frac{1}{5}+ frac{2}{5}= frac{3}{5}$