Water wisteria is an aquatic plant that is easy to care for and reproduces very quickly. A small man-made pond of 350 L contains 78 water wisteria plants. 15 new plants are introduced daily to the pond, while 50 plants are taken out once a week to be sold at local pet shops. The water wisteria plants reproduce at a rate of two plants per day. 

1.  What is the overall population change in a two-week period? 

Round to whole number

 

Answ

2.  What is the population density of water wisteria at the beginning?