chameleonkids wrote:I know the formula for these in the terms of P(t)=Po^ekt
Maybe "P(t) = P0
e^(kt)"? And that's just for exponential growth.
chameleonkids wrote:U.S. Census Bureau data shows that the number of families in the United States (in millions) in year x is given by h(x)=51.42+(15.473)*log x, where x = 0 is 1980.
This isn't exponential growth, so the formula is different.
chameleonkids wrote:b) When will there be 80 million families? I know the answer and how many years time but I need to show work. This is what I have so far
Now subtract the 51.42, divide through by the 15.473, and then raise both sides as powers
of 10. Simplify to get the answer.
chameleonkids wrote:2. The age in years of a female blue whale is approximated by t=-2.57ln(87-L/63)
a) How old is a female whale that measures 80 feet?
Plug "80" in for "L", and simplify to get the answer for "t".
chameleonkids wrote:b)What is the length of a female blue whale that is 4 years old?
Plug "4" in for "t", and solve to get the answer for "L".