book Maths Puzzle Numerical Ability

the number which best completes the sequence 39 9 4 5 25 20 21 441?

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book Other Question

i am having problems with the slopes in graphing equations. i have
(4,5) (2,3)
m=3-52-4 = -2-2
now i am suppose to write weather the line is vertical or horizontal....how do find four consecutive odd integerssuch that the sumof the second and the fourth is 63 more than one-fifth of the third.