book Maths Puzzle Numerical Ability

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

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book Other Question
A car was to be sold at a 20% discount, which amounted to $2,200. How much would the car sell for after the discount? please help me find all the roots of the equation: x^7-2=0