A group of hikers is descending a mountain at a rate of 400 feet per hour. After three hours, what integer represents their total change in elevation? I am not sure if it's -1200 (because it said descending)
Or if it's just 1200

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Will give brainliestbased on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m?

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?