math help 7th grade advanced question

[ash7564]

jphn is twice as old as his son.In 42 years ,the ratio of ther ages will b 4:3 .what is the son's current age? another prob. is a rectangle with vertices at (2,5),(7,5),(7,8),and (2,8) is revolved around the line y=5 to obain a cylinder. what is the valume of the cylinder? express ur answer in terms of pi

 

[Deleted member 4993]

jphn is twice as old as his son.In 42 years ,the ratio of ther ages will b 4:3 .what is the son's current age? another prob. is a rectangle with vertices at (2,5),(7,5),(7,8),and (2,8) is revolved around the line y=5 to obain a cylinder. what is the valume of the cylinder? express ur answer in terms of pi

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