exam Maths Puzzle Numerical Ability

On June 1st, a school teacher signed a 2-month note for $600 at 12% to pay for a vacation. On July 1st, he paid $300 on the loan, and July 31st, he paid off the loan. What is the

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Marge can paint her house in 12 hours. If John helps her it takes them 9 hours. How long does it take John to paint the house by himself Find the domain of the function: f(x)= square root of (2x-8)

...then write your solution in interval notation