1. When you multiply a positive integer by a negative integer or a negative integer by a positive integer, the product is (positive?/negative?) 2. When you multiply a negative integer by a negative integer, the product is (positive?/negative?)

3. When you multiply an even number of a negative integers, the product is (positive?/negative?)

4. When you multiply an odd number of negative integers, the product is (positive?/negative?)

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?