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Reika [66]
2 years ago
14

X intercept of x+y=5

Mathematics
1 answer:
Zepler [3.9K]2 years ago
4 0

Answer:

(5,0)

Step-by-step explanation:

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Mark can remember only the first 4 digits of his friend's phone number. He also knows that the number has 7 digits and that the
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Answer:

<em>19800 seconds, or 330 minutes, or 5 hours + 30 minutes</em>

Step-by-step explanation:

<u>Number Permutations</u>

We know the phone number has 7 digits, 4 of which are known by Mark. This leaves him 3 digits to guess with. We also know the last one is not zero. The number can be represented as

XXY

Where X can be any digit from 0 to 9 and Y can be any digit from 1 to 9. The first two can be combined in 10x10 ways, and the last one can be of 9 ways, this gives us 10x10x9 = 900 possible permutations.

If each possible number takes him 22 seconds, every possibility will need

22x900=19800 seconds, or 330 minutes, or 5 hours + 30 minutes

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2 years ago
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Answer:

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Step-by-step explanation:

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