An electrician has $120 to spend on interior light fixtures. the wholesale price for 13-watt low-energy lamp is $4. the price for a high-energy lamp is $5. write an expression for how much the electrician spends for a units of the low-energy lamp and b units of the high-energy lamp. complete the table for the electrician's purchase. assume that all of the $120 is spent

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?