What is 2 1/4% of 400​

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

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?

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !