Multiple regression, I need assistance. I only know a bit of bivariat regresion.

Three successive multiple regression models predicting the amount of sexual partners.

Dependent variabel= number of sex partners (the total amount of sex partners)

Variables:
Female (Men=0, Female = 1)
Age (age in in years)
Educ_years (education in years)
Sex_debut (age of respondents sexual debute)

Question 1)
What's the predicted amount of sexpartners for a 30 year old female according to model 1?

Question 2)
What happened with the variable Age in model 3?

Question 3) What's the predicted amount of sex partners for a 30 year old women according to model 3?

Question 4) What variable has the strongest effect on the amount of sex partners according to model 2?

Question 5)
How does one interpret the regression coefficients of the variables Age_x_age and sex_debut in model 3?


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