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motikmotik
3 years ago
10

An airplane descends 2.8 miles to an elevation of 5.85 miles. Find the elevation of the plane before an airplane descends 2.2 mi

les to an elevation of 5.85 miles. Find the elevation of the plane before its descent.
descent.
Mathematics
2 answers:
Natali5045456 [20]3 years ago
7 0

Answer:

8.05 miles

Step-by-step explanation:

If it descended 2.2 miles to 5.85 miles then that means it was at 5.85 + 2.2 miles before its descent.

5.85 + 2.2 = 8.05

Advocard [28]3 years ago
4 0

Answer:

8.05 miles

Step-by-step explanation:

5.85 + 2.2 = 8.05

5.85 + 2.8 = 8.65 (not the answer, but as an example ;b

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2.333... (infinite number of digits, all equal to three) is rational because it is equal to 7/3.

sqrt(2) is not a rational number. This is not completely trivial to show but there are some relatively simple proofs of this fact. It's been known since the greek.

pi is irrational. This is much more complicated and is a result from 19th century.

As you see, there is absolutely no mention of the digits in the definition or in the proofs I presented.

Now the result that you probably hear about and wanted to remember (slightly incorrectly) is that a number is rational if and only if its decimal expansion is eventually periodic. What does it mean ?

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2 years ago
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