3 years ago

Will give brainliest

Mathematics

2 answers:

lubasha [3.4K]3 years ago

7 0

Answer:

Step-by-step explanation:

lions [1.4K]3 years ago

7 0

Answer:

Step-by-step explanation:

1/2 ( 4^2 + √25 + 1)

= 1/2 (16 + √25 + 1)

= 1/2 ( 16 + 5 + 1)

= 1/2 ( 21 + 1)

= 1/2 (22)

= 1/2 x 22/1

= 22/2

= 11/1 = 11

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Mrs. Smith's class is working on a variety of science experiments. Each

SVETLANKA909090 [29]

Answer:

Step-by-step explanation:

If there are n 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 twice. Example: student A can be paired with student B,..., student B can be paired with student A. The pair was counted two times.

See the attached image that shows pairings of 5 students. There are

5(5 - 1)/2 = 5(4)/2 = 10 pairs.