K+15
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11 + 6k = 65 Subtract 11 from both sides: 6k = 65-11 6k = 54 Divide by 6 to get k: k = 54/6 k = 9
k=4
11 - 5k. If k is a number then substitute it in. Example if k were to equal 2, then 11 - 5*2 = 11-10 = 1. It depends on the value of k.
k = 2 7 + (5 x 2) = 17 (8 x 2) + 1 = 17
5 Σ (10)^k-1 K=1 I recently had to do this problem. Pain in the a** if you ask me but I solved it for you, so it's okay :D