Answer parts...

a) find the least-squares regression line treating the commute time, x, as the explanatory variable and the index score, y, as the response variable.
b) interpret the slope and y-intercept, if appropriate.
c) predict the well-being index of a person whose commute is 35 minutes.
d) suppose Barbara has a 15-minute commute and scores 68.4 on the survey. Is Barbara more "well-off" than the typical individual who has a 15-minute commute?

Marco is studying a type of mold that grows at a fast rate. he created the function f(x) = 345(1.30)x to model the number of mold spores per week. what does the 1.30 represent? how many mold spores are there after 4 weeks? round your answer to the nearest whole number. 1.30 represents the number of mold spores marco had at the beginning of the study; 985 mold spores 1.30 represents the number of mold spores grown in a given week; 448 mold spores 1.30 represents the 30% rate of weekly growth; 345 mold spores 1.30 represents the 30% rate of weekly growth; 985 mold spores

What is the value of x when x + 7 = 21?

What is the equation of a line passing through (-6,5) and having a slope of 1/3