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2 answers:
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Answer:
66
Step-by-step explanation:
If there are <em>n</em> students, then the number of pairs is .
With 12 students, 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.
See the attached image that shows pairings of 5 students. There are
5(5 - 1)/2 = 5(4)/2 = 10 pairs.
The number of muffin can yield is 18.
Step-by-step explanation:
Given:
The recipe needs cup chopped apple.
To find:
Umber of muffins when 1 cup chopped apple is given.
Solution:
1 ÷
= 1.5
1 cup apple is 1.5 times of
cup of apple
So, the number of muffins will be = 12 × 1.5
= 18
Thus 18 muffins can be yielded from a batch that contains 1 1/8 cups of chopped apple
Answer:
$110
Step-by-step explanation:
We are looking for the decrease in money per desk purchased. Because the x-axis is the number of desks purchased, what we have to find is the (opposite) of the slope. The formula to represent slope can be written as:
We can substitute the points given, (2, 480) and (5, 150) and simplify:
We would multiply by -1 because we are asking for the decrease, and negative increase is decrease. -1 * -110, gives us $110