Question

convert 7light years to metres

Answer 1

1 light year = 9.461 × 1015 metres
7 light years = 6.623 × 1016 metres

Answer 2

$1light \: year = {9.46} \times (10)^{15} m \\ so \: 7light \: year = \\7 \times {9.46} \times (10)^{15} m\\ = 6.622 \times {10}^{16} m$