book Maths Puzzle Numerical Ability

"What is the meaning of open sentences"

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book Other Question

When a 100-m building is imploded, about how long does it take for a piece that breaks off from the roof to fall to the ground ? two candidates attempt to solve a quadratic equation of the form x2+px+q=0.one starts withmany value of p and his roots are -4 and 3. The other starts with a wrong value of q and h