Tìm tất cả các hàm số f: Z-->Z thỏa:
f( f(x)+f(y) ) = x+y+1, với mọi x, y thuộc Z

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?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

Rewrite the equation x = 65 - 60p by factoring the side that contains the variable p.