Math :)

posted by .

1.Try to solve this problem without using a formula. Suppose a disease is transmitted from an individual to one other during the period of a week. Each of those two gives the disease to two more people in the second week, so that the total of newly infected people is now four. Each week the number of infected people double. If the spread of the disease continues, how many weeks will it take a city of 300,000 people to have all been infected?
Use the growth and decay formula to solve the following problem:
Zebra mussels from Europe began invading the Mississippi River in 1988. In 1997 a portion of the river contained an average of 10 zebra mussels per square mile. The exponential growth rate was 340% (k=3.4). Predict the number of mussels per square mile in this portion of the river in 2002 (five years later).


For number 1 I got 19 weeks?
number 2 I am not sure how to do this problem I just need some help with the formula.

Thanks!

  • Math :) -

    Pe^kt

  • Math :) -

    Im not sure what you mean by that??

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    This is a statistics problem. A laboratory test for the detection of a certain disease give a positive result 5 percent of the time for people who do not have the disease. The test gives a negative result 0.3 percent of the time for …
  2. biology

    Genetic problem Schilder's disease, which causes a progressive degeneration of the nervous system leading to death at about two years of age, behaves as a simple autosomal recessive trait. If a couple loses their first two children …
  3. Math

    Scientists are researching a contagious disease. They found that, on average, each person who is infected transmits the disease to 0.03 other people within one year. Currently, there are 3,000 infected people in the country. Use Excel …
  4. Statistics

    A group of doctors is trying to see if a vaccine causes a certain type of disease. They take individuals with the certain disease and individuals without the disease. They then use research to estimate the relative incidence of the …
  5. Probability

    Suppose that 3% of the population ha a certain disease. We have a test for the disease. 97% of those who actually have the disease will test positive. 12% of those who do not have the disease will also test positive. What is the probability …
  6. Math work problem

    If a disease is transmitted from 1 individual to 2 more each week, and we began with 2 individuals being ill, how many weeks until at least 30 people are infected?
  7. statistics

    A test designed to check for sickle-cell anemia has an 85% chance of detection in that, if a person has the disease, there is an 85% chance that the test will be positive. And, if the person does not have the disease, there is an 85% …
  8. Probability Questions - STAT

    1) The probability of getting a certain disease is 0.2. A certain test is available which returns a positive result 90% of the time for those with the disease, and a negative result 75% of the time for those without the disease. Compute …
  9. STAT Help Please!

    The probability of getting a certain disease is 0.2. A certain test is available which returns a positive result 90% of the time for those with the disease, and a negative result 75% of the time for those without the disease. Compute …
  10. STAT

    The probability of getting a certain disease is 0.2. A certain test is available which returns a positive result 90% of the time for those with the disease, and a negative result 75% of the time for those without the disease. Compute …

More Similar Questions