Suppose there is a box containing 9 white balls, 3 black balls, and 4 red balls. is it possible to add the same number of balls of each color to the box so that when a ball is drawn at random the probability of the event that is a black ball is the following? a) 1/3
b) 0.24
explain what number needs to be added to get this answer!

The westins and the shermans live in the same city and pay the same sales tax rate, and both families made $14,000 in taxable purchases last year. if the westins made $86,000 and the shermans made $33,000 last year, is the sales tax in their city an example of a regressive tax? yes, because the westins and the shermans both paid the same sales tax rate. b. no, because the shermans paid a higher percentage of their income in sales tax than the westins did. c. no, because the westins and the shermans both paid the same sales tax rate. d. yes, because the shermans paid a higher percentage of their income in sales tax than the westins did.