10. What is the volume of the triangular prism below?
A. 448.5 in
7.8 in
B. 234 in
6 in
C. 345 in
11.5 in
D. 172.5 in
5 in

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)