The answer is bulimia nervosa :)
Rate of change is 1.50 / Initial value is 6 / y=mx=b / 15=1.50(6)+b /15=9+b / 6=b(initial value)
Answer: physical, mental, and social
Explanation: The health triangle consists of three sides: Physical Health, Mental health, and Social health. I hope this answers your question!
I think you mean sperm cell. It is called fertilization.