What property is used for 3c+12=-28+ 13c

Solve this and show you’re work step by step ! -5 3/4+3h< 9 1/4 -

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?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle