Question

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

Answer 1

Answer:

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