3 years ago

10 points ! I’m really trying to pass this but I just don’t get it. help pls! :((

Mathematics

1 answer:

m_a_m_a [10]3 years ago

5 0

Answer:

how about you stop being confused

Step-by-step explanation:

just read the question

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An airplane climbs 100 feet during the first second after takeoff. In each succeeding second it climbs 100 feet more than it cli

tigry1 [53]

Answer:

15 seconds.

Step-by-step explanation:

∵ The distance covered by plane in first second = 100 ft,

Also, in each succeeding second it climbs 100 feet more than it climbed during the previous second,

So, distance covered in second second = 200,

In third second = 300,

In fourth second = 400,

............, so on....

Thus, the total distance covered by plane in n seconds = 100 + 200 + 300 +400......... upto n seconds

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$\implies 50n+50n^2=12000$

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$n^2+n-240=0$

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$n(n+16)-15(n+16)=0$

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Hence, after 15 seconds the plane will reach an altitude of 12,000 feet above its takeoff height.

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