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boyakko [2]
3 years ago
9

Can anyone answer this

Mathematics
1 answer:
notka56 [123]3 years ago
8 0
I can’t seem to look at the bottom two answers and the two ( A and B) are not correct. So you’re left with either C or D
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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
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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,

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

=\frac{n}{2}(2\times 100 + (n-1)100)  ( Sum of AP )

=\frac{n}{2}(200+100n-100)

=\frac{n}{2}(100+100n)

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\implies 50n+50n^2=12000

n+n^2=240

n^2+n-240=0

n^2+16n-15n-240=0

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

(n-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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Anya says, 62,996 rounds to 63,000 select all the places to which she could have rounded the number
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