Simplify the following expression.
5x [13 + 10 = (3 + 2)] + 9x2

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

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?

Find the interior angle of a regular polygon which has 6 sides