Use the results of Table 5.11 to determine the best big-Oh form for each of the following

Question:

Use the results of Table 5.11 to determine the best "big-Oh" form for each of the following functions f: Z+ → R.
(a) f(n) = 3n + 7
(b) f(n) = 3 + sin(l/n)
(c) f(n) = n3 - 5n2 + 25n - 165
(d) f(n) = 5n2 + 3n log2n
(e) f(n) = n2 + (n - l)3
(f) f(n) = n(n + 1)(n+2)/(n + 3)
(g) f(n) = 2 + 4 + 6 +∙∙∙∙∙∙∙∙ + 2n