3 years ago

If you give 15% that 72 dollars. How do you had

Mathematics

2 answers:

tino4ka555 [31]3 years ago

7 0

I don't quite understand the question but I added .15 and 72 and got 10.8 so yeah

sweet [91]3 years ago

3 0

I'm not sure what you rquestion is exactly but i got 10.8 as the amount that you give

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Answer:

Step-by-step explanation:

If there are <em>n</em> students, then the number of pairs is $\frac{n(n-1)}{2}$ .

With 12 students, $\frac{12(12-1)}{2} = \frac{132}{2}=66$ pairs can be formed.

The reason the formula works is this: Each of the 12 students can be paired with 11 other students (no student is paired with him/her self). But counting 12 x 11 = 132 counts each pair <u>twice</u>. Example: student A can be paired with student B,..., student B can be paired with student A. The pair was counted two times.

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