Atmospheric carbon dioxide (CO) is believed to be a primary factor in global warming. Levels
of CO2 are increasing because human activities,
such as burning fossil fuels, send more CO, into
the atmosphere than natural biological processes
remove. Estimates in 2012 suggested that Earth's
atmosphere contained 393 parts per million (ppm)
of CO, with another 2 ppm added each year.

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis. y = 7ex, y = 7e^-x, x = 1; about the y-axis

Which set of lengths could represent the sides of a triangle? a. 3, 7, 10 b. 4, 5, 10 c. 6, 8, 14 d. 12, 6, 7