Answer:
⚪ 4: three right triangles and one acute-angled triangle.
Step-by-step explanation:

A.

b and c.
add 5 to both sides:

subtract 3n from both sides:
Multiply 400 by 800s to get 320000s
Answer:
3
Step-by-step explanation:
I am pretty sure it is 3, because 3+3 is 6+5 = 11
The other box also has 11
So I think the x is 3.... Hope this helps