A sample of a radioactive isotope had an initial mass of 360 mg in the year 1998 and decays exponentially over time. A measurement in the year 2004 found that the sample's mass had decayed to 270 mg. What would be the expected mass of the sample in the year 2011, to the nearest whole number?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?