Answer:
8658 ft.
Step-by-step explanation:
Volume= length*width*height
rectangle= 21*18*13= 4914
triangle= 16*18*13= 3744
4914+3744=8658
should be 3^X = 7 and X = log7/log3
No solution
since it equals a negative 3 in the original equation it cannot be solved
