To aid in the prevention of tooth decay, it is recommended that drinking water contain $1\mathrm{.}20ppm$ fluoride, $F^{-}.$

How many grams of $F^{-}$must be added to a cylindrical water reservoir having a diameter of $9\mathrm{.}75{10}^{2}m$ and a depth of $30\mathrm{.}60m?$

n

Incorrect

How many grams of sodium fluoride, NaF, contain this amount of fluoride?

mas

Incorrect