Please help urgently

For the elementary reaction A+BC+2D Write an expression for the rate of reaction of A. (Use +1 and -1 to indicate a+ve or -ve sign) rA=kfCACBkrCCCC What are the units of the rate constants in your rate equation? (Use L, mol and s) kf:(kr:(//x(s)1x(s)1 Express rC in terms of rA. (To indicate the sign type -1 or +1. ) rC=rA Express rD in terms of rA. rD=rA