4.3.PS-8 Hiking The scatter plot shows a hiker's elevation above sea level during a hike from the base to the top of a mountain. The equation of a trend line for the hiker's elevation is y = 9.36x + 648, where x represents the number of minutes and y represents the hiker's elevation in feet. Use the equation of the trend line to estimate the hiker's elevation after 140 minutes. feet above sea level. After 140 minutes, the hiker's elevation will be about (Round to the nearest whole number as needed.)