book Maths Puzzle Numerical Ability

please help me find all the roots of the equation: x^7-2=0

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how can I solve for x????
The secretion of hermones into the blood is often a periodic activity.
If a hermone is secreted on a 24 hour cycle, then the rate of change the level of During a kayak race, a paddler can travel a distance of 400 m in 70 seconds. Calculate the average speed of the paddler in a) m/sec and b) Km/hr.