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monitta
3 years ago
5

Suppose x and y vary together such that x is 7 times as large as y. write a formula that defines x in terms of y.

Mathematics
1 answer:
Ainat [17]3 years ago
4 0
Since y is less than x by 7 times \frac{x}{7}=y so in terms of x we write
x=7y
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9514 1404 393

Answer:

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Since we don't care about the order, we can divide this number by the number of ways two students can be ordered: AB or BA, 2 ways.

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__

<em>Additional comments</em>

This sort of selection (2 out of 25) has a formula for it, and an abbreviation for the formula.

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If you can typeset this, it is written ...

  \displaystyle\binom{n}{k}=\frac{n!}{k!\cdot(n-k)!}

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