Step-by-step explanation:
b(h) = 212 - 1.72×h/1000
what is h, when b = 190 ?
190 = 212 - 1.72×h/1000
-22 = -1.72×h/1000
22000 = 1.72×h
h = 22000/1.72 = 12,790.69767... ≈ 12,791 ft
