Question

A sand dune stands 5 feet above sea level. The hill is eroding at a rate of 1 foot per 20 years. Let y represent the height of the sand dune after x years. Which equation represents the situation?

A. y = 5 - (1/20)x
B. y = -2x + 5
C. y = -20x - 5
D. y = -20x + 5

Answer 1

The equation that represents the situation is y = 5 - (1/20)x. This equation represents the height of the sand dune, y, after x years.

Step-by-step explanation:

The equation that represents the situation is y = 5 - (1/20)x. This equation represents the height of the sand dune, y, after x years. The equation shows that the height of the sand dune decreases by 1 foot for every 20 years that pass.