exam Maths Puzzle Numerical Ability

please help with proof

given triangle psr is a right triangle with altitude sq drawn to hypotenuse pr

prove pr/ps =ps/pq



thanks

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exam Other Question
Solve each of the system by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3

Any help is appreciated. Thanks Burundi has a population of 7548000 in 2008, it has a growth rate of 3.9%, what is the approximate population in 2012? I cannnot find a formula to work this. Is there one specific for growth? thanks in advance for your help!!!