A space rocket has 3 stages:
- stage 1, s1;
- stage 2, s2;
- stage 3, s3.
If s1 burns 3 x as long as s2 which burns 2 x as long as s3 then how long did s3 burn if the total burn time was tt minutes? How long did s2 burn? s1?
Extract leading non-zero digit
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Is this matrix orthogonal?
Is A the inverse of B?
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