Triangles have 3 vertices. The total is 21 vertices. 21 / 3 = 7. He drew 7 triangles.
Answer: 
Step-by-step explanation:
I think the average spend is 11 km. i don't know for sure..
8.605
This number is bigger than 6.604 and it is smaller than 8.643
:)
Answer:

Step-by-step explanation:
Flip the equation.

Add -9 to both sides


Divide both sides by 7/8

hope this helps