celeration. The shell is fired at a fixed angle of $35.$

a$.$ Find the range if muzzle speed of the shell is $30$ m$/$s$.$

b$.$ Use linear approximation to estimate the change in range if the muzzle speed of

the shell is decreased by $0\mathrm{.}75$ m$/$s $($from $30$ m$/$s$).$

c$.$ How much can the muzzle speed of the shell vary $($from $30$ m$/$s$)$ if the maximum

allowed variation in range is $3$ m$?$ Use linear approximation to estimate the result.