13. that's all there is to it.
7(1)+6
7+6
=13
7x1=7
7+6=13
so 13 is your answer :D
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indentity property
6x10+3x1+7x1/10
6x12=72+654=726+555= 1281
36:)
106.790 =(1x100) + (0x10) + (6x1) + (7x1/10) + (9x1/100)100 + 0 + 6 + 7/10 + 9/100