let's take it to 2 parts
first part is rectangular prism
volumn = width • length • height
= 13 • 13 • 30 (in • in • in)
= 5070 in^3
second part is triangle prism
volumn = base area • height
= (1/2* 9 • 13) • 30 (in • in • in)
= 1755 in^3
so the volumn of this figure is 5070+1755 = 6825 in^3