help with this please

Consider the following sample regression explaining birthweight as a func- tion of cigarettes smoked by the mother, log of family income, the birth order of the child, the gender, whether or not the child's race is white, and the levels of mother's and father's education: log(bught) = 4.65-.0052cigs+ .0110log(faminc) +.017parity+.034male (.38) (.0010) (.0085) (.006) (.011) +.045white - .0030motheduc + .0032 fatheduc (.015) (.0030 (.0026) a) Interpret the coefficient on cigs. What is the effect of smoking 5 more cigarettes per day? b) Report the value of twhite and interpret the coefficient on white. Ceteris paribus, how much heavier is a white child predicted to weigh than a non- white child? Is this difference statistically significant at the 5% level