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3 years ago

Simplify 2x^2 - x^2, not solving for c

Mathematics

1 answer:

MArishka [77]3 years ago

8 0

I hope this helps you 2x^2-x^2=x^2

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Answer:

-5 ± √5² - 4 · 1 · 4

2 · 1

Step-by-step explanation:

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2 years ago

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:

19800 seconds, or 330 minutes, or 5 hours + 30 minutes

Step-by-step explanation:

Number Permutations

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

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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.

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