Y=.04x^2+8.3x+4.3. how would i solve this?

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

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?