Hot-Air Balloon Project
By Kennedy, Katie, and Alaina
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Here is the chart. Every 5 minutes, it descends 100 feet, and every 1 minute, it descends 20 feet.
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It was 900 ft. above the ground. You can tell because if you go to x=-5, (which would be five minutes before seeing it because the x is minutes) the y, or feet=900. Also, our chart shows that it is at 900 feet if you need more evidence.
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30x. 1st and 4th are together at 16 minutes, 480 feet up in the air. Where the two lines intersect is where the two balloons meet. The fourth balloon's line goes up because its height does, while the other's goes down just as the balloon does. They meet at 16 minutes, and 480 feet, just like the labeled point says.
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The third balloon would have to start at 1200 feet to end at the same time as the first, which makes sense since it goes 150% faster downwards and 1200 is 150% of 800. The equation of the line is 1200-30x.