What are the coordinates of the midpoint of the segment whose endpoints are a(-1,-2) and b(6,12)?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

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Ihonestly have no clue if it's each or none.