Today isaac needs to walk his dog water the garden and feed his fish. d is the number of minutes it takes to walk his dog g is the number of minutes it takes to water the garden and f is the number of minutes it takes to feed the fish the experssion g+(d+f) describes the total number of minutes it takes isaac to do all three tasks. we can also use expression (g+d)+f to represent the same quantity. math each amount in the situation with thr expresion that represents it.