book Maths Puzzle Numerical Ability

a football player runs directly down the field for 35 m before turning to the right at an angle of 25 degree from his original direction and running an additional 15 m before getti

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In this problem I need to find the value of the variable:: A=P(1+rt) (banking formula to find the amount of an account); find r when A=1050,t=1,and P=1000 x^3+x^2+ sqrt(x^2+3x)=6

I've tried to square both sides, I've tried setting the equation equal to 0, I've tried to factor out x^2+x, I'm just at a loss.

Thanks for your help!