<PRE><B>Question 1183417</B>
Look at previous very similar problem already solved for #1.
https://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.274639.html
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Your question #2 is faulty.  270C temperature in a region but no indication of altitude.  Maybe this is relative to the next two-dimensional point?


At the region taken as 0 meter above it, so the point is  (0, 270) and your next point would be  (2500, 120).  So if this is linear relation ship then {{{T=mh+b}}}, and then m for slope,  {{{T=((120-270)/(250))h+270}}}; do from this what you need.</PRE>