Answers edited by Bounce light knowledge

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• A stone of mass 1.0kg is dropped from a certain height and takes 8 seconds for the stone to strike the sandy ground, upon reaching the ground the stone penetrate 5.0 into the ground ( take g=10m/s) A)calculate de height from where the stone is dropped?
  
• How do you divide #3x^3+5x^2+2x-12# by #x+3#?
  
• What is the length of an arc of circle, knowing the central angle of (pi/4) and radius of 7cm?
  
• How do you find all the zeros of #f(x) = 3x^2 − 4x − 15#?