exam Maths Puzzle Numerical Ability

a rational number has a decimal which either terminates or repeats endlessly,
while an irrational number has a decimal which continues endlessly and without repeating. is this true or false?

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exam Other Question

A parsec is approximately 3.1 x 1016 meters. If the distance to the farthest observable galaxies is approximately 1.62 x 109 parsecs, approximately how many meters is it to the farthest observable galaxies?

please help me. thanks I am not good at all with word problems and need some help