Algebra II
posted by Joy .
The barometric pressure in inches of mercury at a height of h feet above sea level is
p=30.0e^kh
where k=3.83*10^5. At what height will the pressure be 10.0 in. of mercury.

I assume h is the height, so
30 e^(kh) = 10
e^(kh) = 1/3
 kh = ln (1/3)
kh = 1.098612...
h = 1.098612/k = 28684.4
check:
30 ( e^(.0000383(28684.4))
= 30(.3333333) = 9.9999997 , not bad