exam Maths Puzzle Numerical Ability

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!!!

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exam Other Question

I am suppose to solve the equations and then check my answer. Where do I start?
sqrtx+4=3
I can put it like this too and the radical sign covers the x+4.
√x+4=3 I need help finding the answer to this question.
The length of one of the equal legs of an isosceles triangle is 8 cm less than 4 times the length of the base. If the perimeter is 29 cm, find the length of one of the equal legs.