After a number is decreased by 30%, the amount after the change is 140. What is the original number? Show your work.

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?

What is the y-intercept of the line with the equation 3x + 4y = 12?

The difference between the number of electoral votes for florida and north carolina is 12 votes. write and solve a subtraction equation to find a number of electoral votes for florida.