What Predicts the Amount of Time That People Spend on the Internet

What predicts the amount of time that people spend on the Internet? Based on 2016 GSS data, the regression of hours per week on the Internet (Y) on age, education (number of years completed), and verbal ability (number of correct words on a ten-item vocabulary test) produced the following equation:
Y = 9.327 - .161Age + .348Educ + .489Verbal
a. Explain the meaning of the regression coefficient for Educ (years of education completed)?
b. How much does hours on the Internet change for each increase of one year in a respondent's age?
c. Calculate the number of hours per week on the Internet for a 30-year-old with 16 years of education who got all ten words correct on the vocabulary test.
Using standardized regression coefficients, the multiple regression of Internet hours has the following values (all coefficients are statistically significant):
Y = - .179Age + .065Educ + .064Verbal
d. Which variable has the largest effect on weekly hours on the Internet?