Answer:
5(10k + 1) + 2(2+8k)
Use distributive property
5(10k)+5(1)+2(2)+2(8k)
50k+5+4+16k
combine like terms (50k and 16k are alike as well as 5 and 4)
50k+16k and 5+4
66k+9 is the answer
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