For the function $A(t)=-0\mathrm{.}27t^4+1\mathrm{.}77t^3-3\mathrm{.}34t^2+1\mathrm{.}90t+1\mathrm{.}00(propulsion$ provided

$by$ a rocket$),$ determine the second derivative $A^{\text{'}\text{'}}(t)$ and then use $itto$ calculate $A^{\text{'}\text{'}}(4).$ Your

answer needs $tobe$ accurate $to$ two decimal places.

Answer