math
posted by alyssa .
In a study of the change of insect population,there was about 170 insects four weeks after the study began and about 320 after two more weeks. Assume an exponential model of growth.
a.Find an equation relation the population to the time in weeks.
b.estimate initial number of insects
Respond to this Question
Similar Questions

MATH
A population of insects increases at a rate of 250 + 16t +0.3t^2 insects per day. Find the insect population after 3 days, assuming that there are 40 insects at t=0. 
Calc
The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours. a) Find the initial population. b) Write an exponential … 
PreCalc
A weekly census of the tree frog in a park is given week population 1 18 2 54 3 162 4 486 5 1458 6 4374 a. find the function of the form f(x)=Pa^x that describes the frog population at time x weeks. b. what's the growth factor in this … 
calculus
A population of a very rare insect in an area in a discrete rural region in ASEAN will grow at a rate that is proportional to their current population. In the absence of any outside factors, the population will triple in two weeksâ€™ … 
Algebra 2
Recursion formula for a given population for each interval,n, at a time, and k is a constant called the Malthusian factor: a_n=ka_n1(1a_n1)  Assuming n is measured in weeks, calculate the insect population for weeks 2, 3, and 4 … 
Pleaaaaaase help with differential graph question
Suppose further that the populationâ€™s rate of change is governed by the differential equation dP/dt = f(P) where f (P) is the function graphed. For which values of the population P does the population increase? 
Calculus
1. Calculate the population within a 7mile radius of the city center if the radial population density is ρ(r) = 5(5 + r2)1/3 (in thousands per square mile). (Round your answer to two decimal places.) 2. A population of insects … 
algebra
the number of bacteria in a certain population is predicted to increase according to a continuous exponential growth model at a relative rate of 6% per hour. suppose that a sample culture has an initial population of 94 bacteria. find … 
precalculus
Assume that the number of bacteria follows an exponential growth model: P(t)=P0ekt . The count in the bacteria culture was 900 after 20 minutes and 1600 after 30 minutes. (a) What was the initial size of the culture? 
Math/Precalculus
Assume that the number of bacteria follows an exponential growth model: P(t)=P0e^k/t. The count in the bacteria culture was 400 after 10 minutes and 1500 after 35 minutes. (a) What was the initial size of the culture?