Let r1 and r2 be the roots of the quadratic equation x2 - 12x + 9 = 0. determine the value of 2 + 2 . (hint: in the first recitation the relationship between the coefficients in a quadratic and the sum and product of the roots of the quadratic was proven. use this relationship to solve the problem without finding either root.)

Which fraction below is equivalent to 10/12?

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

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?