Math - Steve

posted by .

I posted this question yesterday that you answered, so thank you, but how do I put this in my calculator to get this answer?

If the exponential equation of best fit is y= 2.9046(1.9798)^x, when will the population be more than 13 million?

How would I figure this out?

I already determined the population in 30 days was 2,299,989,909 which is quite far from 13 million, but that gave me the number of days to figure out. How do I figure out when they give me the answer and I have to figure out the number of days?

math - unowen yesterday at 2:53pm
Solve for y=13. So:
ln 4.47566=ln 1.9798^x=x ln 1.9798
The number of days, at that rate, would be 2.1942355

math - Steve yesterday at 4:17pm
except you want

2.9046(1.9798)^x = 13000000
x = 22.42

  • Math - Steve -

    Steve may not be online right now.

    Going with his equation,
    2.9046(1.9798)^x = 13000000
    first divide both sides by 2.9046
    1.9798^x = 4475659.299.. (keep in your display)
    take log of both sides, and use your log rules
    x log 1.9798 = log 4475659.299
    x = log 4475659.299/log 1.9798
    = 22.42.. as Steve had

    by keeping the 4475659.299.. in the display, we can just continue our sequence of calculations.
    I then pressed:
    log 1.9798
    to get the answer

Respond to this Question

First Name

School Subject

Your Answer

Similar Questions

  1. math

    1. The table shows the number of wild strawberry plants in a particular forest t years after a forest fire. Use a graphing calculator to find the exponential function that best fits the set of data. Number of Wild Strawberry Plants …
  2. advanced math

    I'm not sure how to find the line of best fit. I have two equations, linear and quadratic. I graphed them on my calculator, but now I don't know which one is the best fit. Can I tell by the r^2?
  3. Math

    I posted this problem the other day and someone answered it but when I checked my book I realized that I wrote the problem wrong. This morning when I posted I had put the wrong answer. The answer is suppose to be 1/8 but I don't understand …
  4. math help

    Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on …
  5. Algebra

    I already posted this question,Steve answered it. I just wanted to clarify my answer. Problem:Find h(x) with terms in order of decreasing degree, if 9x^3-3x+1+h(x)=3x^2-5x+3. Steve: h(x) = (3x^2-5x+3)-(9x^3-3x+1) so, just subtract …
  6. Math Check

    Hi! I posted this question yesterday and it was answered but I forgot to add something else to the directions. Directions: Write the system of equations sequentially so that it will correspond to the final matrix. Matrix: [-10 2 | …
  7. math

    Hi, I posted a question yesterday. How do I get to see if someone answered?
  8. Math

    Is (2,12) a solution to the given system?
  9. math

    A data set is shown below. x y 1 6.00 2 5.04 3 4.23 4 3.56 5 2.99 6 2.51 7 2.11 Using an exponential best-fit model, what is the residual when x = 1. Round your answer to the nearest hundredth. This is the problem i dont understand …
  10. math

    If the exponential equation of best fit is y= 2.9046(1.9798)^x, when will the population be more than 13 million?

More Similar Questions