Can you explain how to do this please?
ANSWER ASAP

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

If there are 3.281 feet in 1 meter, how many inches are in one centimeter

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?