By: Isabella Droz and Josh Strong
The first balloon goes down at 20 ft per minute and reaches the ground at 40 min.
It takes 39 min for the balloon to be 20 ft from the ground. At 40 min, the balloon has landed. The balloon is then descending at a rate of 20 feet per minute. So at 39 minutes, it is 20 feet from the ground.
The first balloon, the red line goes down 20 ft. per second and hits the ground at 40 feet. The second balloon or blue line also goes down by 20 but starts 400 ft. higher at 1200. It hits the ground after 60 min.
The first balloon (blue line) goes down much slower than the third balloon (red line) which descends at 30 ft. per minute.
f(x)=30x is the 4th balloons equation. The fourth and 1st are at the same altitude after 16 min and will be at the same altitude of 480 ft. Graphically they intercept at 480 ft. and the coordinates are (16, 480)
The lines intersect at (16,480). The red line is the 4th balloon and the blue line is the 1st.