It is in the tenths place, so it represents 8 tenths.
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The fraction 58 over 8 is just another way of saying 58 divided by 8:58/8 = 58 ÷ 8 = 7.25
The binary number 1000 is the decimal (base 10) number 8. The digits in a binary number are exponents of 2 rather than 10, so that for a four-digit number in binary, the digit places represent 8, 4, 2, 1 1000 (binary) = 8 + (0x4) + (0x2) + (0x1) = 8
--8 10 20 30 40 50 --58
-8x + 6 = -58 -8x = -64 x= -64/-8 x = 8
The number 200 in binary is the eight-digit number 11001000. The digits in a binary number are exponents of 2 rather than 10, so that for an eight-digit number in binary, the digit places represent 128, 64, 32, 16, 8, 4, 2, 1 instead of increasing values of 10. 11001000 = 128 + 64 + (0x32) +(0x16) + 8 + (0x4) + (0x2) + (0x1) = 200