exam Maths Puzzle Numerical Ability

given the inequality |x-3|<_k find the value of k,if possible that satisfies each condition
find the value of k for which inequality has exactly one solution

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exam Other Question

The function h(C)=331+3/5C represents the speed of sound, h, in meters per second, where C is the temprature in Celsius. The celsiuc temprature C can also be expressed as a functio Please help me to solve this equation using the zero-factor property.

5x^2+12=23x