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alex7881
19.09.2019 •
Mathematics
Each row has same number of chairs and number of rows is 1 less than the number of chairs in a row. how many chairs are in each row? a. there are a total of 72 chairs b. after 1 chair is removed from last row, there are 17 chairs in the last 2 rows
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Ответ:
There are 9 chairs each row
There are 8 rows with a total of 72 chairs
Step-by-step explanation:
A)C=Chairs in a row
Total number of rows= C-1
C·(C-1)=72
So now you use BHASKARA to resolve it
C²-C-72=0
(1√1-4·1·(-72))÷2=---> X1=(1+17)÷2= X1=9
> X2=(1-17)÷2 X2=-8
C=9 because X2=-8 cant be because you dont have negative chairs
9·(9-1)=72 Correct
a)There are 9 chairs each row
Ответ: