The number of hours, n, that Gary works at is at least 9/2 per week. Write an inequality to show the number of hours per week that Gary can work.

Explanation:

The word "at-least" defines that the minimum work Gary will do. The statement tells us that Gary will work no less than 9/2 hours. We can tell that the in-equality is n ≥ 9/2, where n is the number of hours.

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not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this