The number of days it takes the water lily population to double will be 3.915.
<h3>What is a regression equation?</h3>
The equation is written as Y= a + bX, where Y is the dependent variable and X is the independent variable.
This is an algebraic idea; imagine the initial number was x and the new number is 2x. If the constant rate of growth is r and the time is D, the function expressing growth will be:
![2x=x(r)D\\\\ 7.830=3.915(1.106)D\\\\ 7.830=3.915(2)D](https://tex.z-dn.net/?f=2x%3Dx%28r%29D%5C%5C%5C%5C%207.830%3D3.915%281.106%29D%5C%5C%5C%5C%207.830%3D3.915%282%29D)
Hence the number of days it takes the water lily population to double will be 3.915.
To learn more about the regression equation refer to the link;
brainly.com/question/7656407