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plug in n = 15 into
a(n) = 4 + 4(n-1)
to get your answer

4+ 4(14) =15(4)= 60

can someone help me

is 51 a perfect square?

yes

it is? so there's some integer that you can square to get 51?

ex: 100 is a perfect square since 10^2 = 100

4 is a perfect square because 2^2 = 2*2 = 4