Question

# A population of 6 mice doubles every 4 weeks. When will this population reach 120 mice? Use an algebraic solving process.

Modeling
A population of 6 mice doubles every 4 weeks. When will this population reach 120 mice? Use an algebraic solving process.

2021-02-06

Step 1 Given, A population of 6 mice doubles every 4 weeks. We have to find when population reach 120 mice Step 2 Now making the table of data $$\begin{array}{|c|c|}Population\ of\ mice (y) & 6 & 12 & 24 48 & 96 & 192 \\ \hline no. of weeks(x) & 0 & 4 & 8 & 12 16 & 20\end{array}$$ Using this data, modeling the equation between the Population of mice (y) and no. of weeks(x) So, the modeled equation is $$y = 6*2^{x/4}$$ Now we want $$y= 120, then\ x=?$$ Substituting $$y = 120\ in\ the\ y = 6*2^{x/4}$$ $$120 = 6^*2^{x/4}$$
$$2^{x/4} = 120/6$$
$$2^{x/4} = 20$$ Taking logarithm both sides $$\ln2^{x/4} = \ln20$$
$$x/4*\ln2 = \ln20$$ $$(\because \ln MP = p\ln M)$$
$$x = \frac{4\in 20}{\ln2}$$
$$x=17.3$$ So, it takes 17.3 weeks to reach the population of mice 120