Let T(d) be the temperature of the seawater in the Mariana Trench d meters below the surface. Find a formula for p(x), the temperature x mm below the surface

Insert 1 for coefficients that do not change and 0 for shifts that are not necessary

My answers

p(x) = 1, T( ) x - 0 ) + 0

I'm trying to find what T is. I tried 1000 and then 100 but it appeared to be wrong. Or do I put 1 or 0 for T depending on shifts that are not necessary