An areoplane travelling from town A to C flies from town A,9km due west to town B and then 12km due south to town C. (i) Sketch a diagram to represent the movement of the areoplane from town A to town C.
(ii) find the total distance covered by the areoplane in flying from town A to town C.​

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?