Darryl's working on another staircase. the volume of the staircase is 34 cubic feet. he poured 3 cubic feet of concrete into the lowest stair and 6 cubic feet into the middle stair. how much concrete does darryl need for the highest stair?

25 cubic feet of concrete

Step-by-step explanation:

Given the information:

the volume of the staircase is 34 cubic 3 cubic feet of concrete into the lowest stair 6 cubic feet into the middle stair

=>The volume of concrete darryl need for the highest stair is:

The volume of the staircase - the volume of the lowest stair - the volume of middle stair

= 34 - 3 - 6

= 25 cubic feet of concrete

Hope it will find you well.