An ostrich that is 108 inches tall is 20 inches taller then 4 times the height of a kiwi. what is the height of a kiwi in inches?

Height of the kiwi = ?  Call it 'K' for now, until we find out what it is.

4 times the height of a kiwi  =  4 K

20 inches taller than that  =  4 K + 20

You said that's 108 inches, so we can write

                                                      4 K + 20 = 108

Subtract  20  from each side:    4 K          =    88

Divide each side by  4 :                 K         =     22 inches .

There are 8,654 left

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats