book Maths Puzzle Numerical Ability

1. 37sqrt2x^5-60x^2sqrt50x

2. 44 ^3sqrt135x^5-90x^3sqrt5x^2

3. 13/^3sqrt25x

4. 3/^4sqrt2

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book Other Question

Jeff leaves his house on his bicycle at 8:30 A.M. and averages 5 miles per hour. His wife, Joan, leaves at 9:00 A.M. following the same path and averaging 8 miles per hour. At what time will Joan catch up with Jeff? I have problems converting word problems into linear equations, could you please help me with this one?
1. America creates more garbage than any other nation. According to Denis H