If 8.4 million baby boomers out of a total 76 million baby boomers have already retired, what percentage of this group will retire in the next 20 years? Round to the nearest whole percent.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b