SOLUTION: solve 16^ d-4= 3^3-d solve 9^x=45 2. The formula p= P(base is 0) (1/2)^h/4795 , is the atmospheric pressure, P, in mm of mercury at elevation “h” meters above sea level.

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: solve 16^ d-4= 3^3-d solve 9^x=45 2. The formula p= P(base is 0) (1/2)^h/4795 , is the atmospheric pressure, P, in mm of mercury at elevation “h” meters above sea level.       Log On


   

Question 892484: solve 16^ d-4= 3^3-d
solve 9^x=45

2. The formula p= P(base is 0) (1/2)^h/4795 , is the atmospheric pressure, P, in mm of mercury at elevation “h” meters above sea level. If P0 is 760 mm, at what elevation is the pressure 42 mm?

2. The following equation models the world population “y”, in billions of people, “x” years after the year 2000.
y=6.72(1.014)^xo
In what year did the population reach about 8 billion?

I get so lost can you show step by step for number 2 i know you sub. 200 where X But after i get lost
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
16%5E%28d-4%29=3%5E%283-d%29
%28d-4%29ln%2816%29=%283-d%29ln%283%29
ln%2816%29d-4ln%2816%29=3ln%283%29-ln%283%29d
ln%2816%29d%2Bln%283%29d=3ln%283%29%2B4ln%2816%29
d%28ln%2816%29%2Bln%283%29%29=3ln%283%29%2B4ln%2816%29
d=%283ln%283%29%2B4ln%2816%29%29%2F%28ln%2816%29%2Bln%283%29%29
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.
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9%5Ex=45
x%2Aln%289%29=ln%2845%29
x=ln%2845%29%2Fln%289%29
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42=760%281%2F2%29%5E%28h%2F4795%29
42%2F760=%281%2F2%29%5E%28h%2F4795%29
ln%2842%2F760%29=%28h%2F4795%29ln%281%2F2%29
h%2F4795=ln%2842%2F760%29%2Fln%281%2F2%29
h=4795%2A%28ln%2842%2F760%29%2Fln%281%2F2%29%29
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.
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8=6.72%281.014%29%5E%28X0%29
8%2F6.72=1.014%5E%28X0%29
ln%288%2F6.72%29=X0%2Aln%281.014%29
X0=ln%288%2F6.72%29%2Fln%281.014%29