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The windows of a downtown office building are arranged so that each floor has 6 fewer windows than the floor below it . If the ground floor has 52 windows, how many windows are on the 8th floor ? A. 10 B. 8 C. 4 D. 6

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The given situation described above is that of an arithmetic sequence with first term (a1) equal to 52 and common difference (d) equals -6. To find the nth term, use the equation,
                                         an = (a1) + (n - 1)(d)
Subsitutitng the known values,
                                         a8 = 52 + (8 - 1)(-6)
The answer to a8 from the equation is 10. 

Answer:

The correct answer is 10 windows are on the eighth floor

Step-by-step explanation:

First floor                           52

Second floor      52 - 6 = 46

Third Floor         46 - 6 = 40

Forth floor          40 - 6 = 34

Fifth floor            34 - 6 = 28

Sixth floor           28 - 6 = 22

Seventh floor     22 - 6 = 16

Eighth floor        16 - 6 = 10

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