The function T of X equals negative twenty five X square root plus eight hundred seventy five X minus four thousand seven hundred fifty over negative one hundred twenty five X plus four thousand seven hundred fifty compares concert profit to operating expenses. Identify all values of X for which T of X is undefined.

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?