Answer:
unit price= yum
Step-by-step explanation:
10. The volume of the triangular prism is
, then
.
11. The volume of the triangular pyramid is
, then
.
12. They have common base (common triangle). y=7.7, r=23.1, then r:y=23.1:7.7=3.
13. See 10 and 11 for notations in symbols.
Answer:

Step-by-step explanation:
This is my best guess
Answer:
6x + 9y
Step-by-step explanation:
3 * 2x = 6x
and
3 * 3y = 9y
then combine them with a plus sign