Acompany estimates its total profit (profit = total revenue minus total cost) as
p(x) = 2x5 − 3x4 − 5x2 − 2, where p is in thousands of dollars and x is the number of years elapsed since the company was founded. solve for the number of times the total profit become exactly zero. hint: use descartes's rule of signs.

oxygen +1 most likely

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.