Find f$\text{'}($a$).$ f$($t$)=6$t$+16$t$+4$ To find f$\text{'}($a$),$ we will use the formulaf'$($a$)=$limta f$($t$)$f$($a$)$ta $.$Since f$($t$)=6$t$+16$t$+4$ we have f$\text{'}($a$)=$limta $6$t$+16$t$+46$a$+16$a$+4$ta $.$Simplifying everything we getf'$($a$)=$limta