4x + 7 = 2x + 19. i know the answer is 6, i need to know how.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

How are sas and sss used to show that two triangles are congruent?

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?