You have constructed wooden forms for pilings. the pilings are in the shape of rectangular solids, each measuring 10 ft. high and 3 ft. square. you are now going to pour cement into 10 of these forms. how much cement will you pour?

We first calculate for the volume of each of the figure by dividing all together the dimensions of the rectangular prism. 
                             Volume = (10 ft)(3 ft)(3 ft) = 90 ft³
Then, multiply the volume of each prism by 10 to get the total amount of cement that needs to be poured.
                       Total volume = (90 ft³)(10) = 900 ft³