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 his fish.
the expression g + d + f) describes the total number of minutes it takes isaac to do all three tasks.
we can also use the expression (g + d) + f to represent the same quantity.
match each amount in the situation with the expression that represents it.