Order the following numbers from least to greatest. Put the lowest number on the left. 2 -2 5 -5
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Let p be the prize of a pen and m the prize of a mechanical pencils. If you buy six pens and one mechanical pencil, you spend 6p+m. We know that this equals 9, because you get 1$ change from a 10$ bill.
Similarly, if you buy four pens and two mechanical pencils, you spend 4p+2m, which is 8$, because now you get a $2 change. Put these equation together in a system:
Now, if you multiply the first equation by 2, the system becomes
Subtract the second equation from the first:
Plug this value into the first equation to get
Given that <span>the number of possible handshakes within a group of n people is given by the equation:
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Given that there are 105 people at a party, the number of possible handshakes is given by:
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Given that there are 105 people at a party, the number of possible handshakes is given by:
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