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k(k + 5)
It is because 3 is a factor of 9. So if 9 is a factor of some number X, then X = k*9 for the factor pair 9 and k But X = k*9 = k*(3*3) = (k*3)*3 so that X is k*3 times 3 ie it is a multiple of 3.
7k^(2) + 7k - 140 Factor out '7' Hence 7(k^(2) + k - 20) Factor inside the brackets 7(k + 5)(k - 4) Done!!!!
k = 5
A rectangle is a 2-dimensional shape. Therefore, it has no volume - which is what capacity measures.