Chapter P, Prerequisites - Section P.1 - Modeling the Real World with Algebra - P.1 Exercises - Page 5: 8

A). Temperature T = 65.5 F B). Elevation = 2000 ft

Here T (Temperature) = 70 - 0.003h A). h=1500 ft, T = 70 - 0.003$\times$1500 = 70 - 4.5 = 65.5 F B). T (Temperature) = 70 - 0.003h i.e h = $\frac{70-T}{0.003}$ = $\frac{70-64}{0.003}$ = $\frac{6}{0.003}$ = 2000 ft