Answer :

Final answer:

The value of f(n) when n = 42 is 945.

Explanation:

The given table shows the values of n and f(n) for the equation f(n) = n(n+3)/2. To find the value of f(n) when n = 42, substitute the value of n into the equation and solve:

f(42) = 42(42+3)/2 = 42(45)/2 = 1890/2 = 945

So, the value of f(n) when n = 42 is 945.

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Rewritten by : Barada

I looked at the the picture and the answer is A. 12

I guess the 2 was supposed to be a question mark judging by the picture...