Answer :

7 x 6 + 4 x 2
42 + 8
50
Alright so we know that n = 4 so we just plug 4 where the n is.

7 × 6 + 4 × 2 

So the first thing you do is multiply 7 × 6 which gives you 42. Then you do the same for 4 × 2 which is 8.

After that you add 42 + 8 which gives you 50.
So your answer is A. 50

Hope that helped!