I would solve this using tangents. Let h be height of flagpole.
Set up 2 right triangles, each with a base of 40.
The larger triangle has height of "h+70"
Smaller triangle has height of 70.
Now write the tangent ratios:

Note: A-B = 9
To solve for h we need to use the "Difference Angle" formula for Tangent

Plug in what we know:



The graph of the line segment PQ is attached. To find the length, we have to use distance formula which is



To find the midpoint,we have to use the formula


Answer:
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Step-by-step explanation: