Answer:
48 cubic feet
Explanation:
Hi, to answer this question we have to apply the next formula:
Volume of a rectangle: width x length x height
In this case the length of the sand box is equal to the sum o f both parts length:
Length = 3 +4 = 12 ft
Replacing with the values given:
V = 4 x 12 x 1 = 48 cubic feet
Feel free to ask for more if needed or if you did not understand something.