4,8,12,16,20,24,28,32,36,40
Answer:



QRS is isosceles
Step-by-step explanation:
Given
See attachment for complete question
From the attachment, we have the following parameters





Solving further, we have:








From the calculations;

<em>This means that: QRS is isosceles</em>
For the 6th one the answer is $30
for the 7th one 83%
for the 8th one 77%
You didn’t provide the graphs but here is where the point would be on the graph.