Chairs

Determine the number of seats in the seventh and ninth rows if the 3rd row has 14 seats and every next row has five more than the previous row.

Correct answer:

a7 =  34
a9 =  44

Step-by-step explanation:

a3=14 d=5 a3 = a1+2d a1=a32 d=142 5=4 a7=a1+6 d=4+6 5=34
a9=a1+8 d=4+8 5=44



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