Gianni went backpacking at Bamboo Mountain. Along his trip, he recorded his altitude above sea level over the number of days he had been backpacking. Gianni created a graph to show this relationship.
first quadrant of coordinate plane titled Gianni's backpacking trip with the x axis labeled time in days and the y axis labeled altitude in feet above sea level, with a line segment from 0 comma 0 to 1 comma 400, a line segment from 1 comma 400 to 2 comma 400, a line segment from 2 comma 400 to 4 comma 800, a line segment from 4 comma 800 to 5 comma 800, a line segment from 5 comma 800 to 7 comma 400, a line segment from 7 comma 400 to 8 comma 400, and a line segment from 8 comma 400 to 9 comma 0
On which interval does the graph show that the function is decreasing?
1 < x < 2
2 < x < 4
4 < x < 5
5 < x < 7
