The life expectancy of a circulating coin is 30 years. The life expectancy of a circulating dollar bill is only 20 as long. Find the life expectancy of circulating paper money

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?