Brass is made up of copper and zinc. every 100 grams of brass contains 20 grams of zinc. a) work out the weight of zinc in 60 grams of brass. brass contains 4 parts by weight of copper to 1 part by weight of zinc. b) work out the weight of copper in 350 grams of brass.

What is x3+3x2−16x−48 divided by x−1?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

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?