Answer
$10011$
Work Step by Step
$19_{10} = ((1 \times 16) + (0 \times 8) + (0 \times 4) + (1 \times 2) + (1 \times 1))_{10} = ((1 \times 2^{4}) + (0 \times 2^{3}) + (0 \times 2^{2}) + (1 \times 2^{1}) + (1 \times 2^{0}))_{10} = 10011_{2}$
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