What is the differential rate expression of the change in b with time. incorporate elements that describe both its formation and reaction

The rate expression of the change in b with time is
rb = k [b]
This is for the formation of b assuming that the reaction is first order with respect to b
For the reaction equation, the expression is
-rb = -k [b]
Again, assuming that the reaction is first order with respect to b

This is what i found on google “when one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and atp is converted to adenosine diphosphate (adp). likewise, energy is also released when a phosphate is removed from adp to form adenosine monophosphate (amp).” i hope this you .