exam Maths Puzzle Numerical Ability

I need a full definition and three examples of Non-linear Function

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exam Other Question

a girl is 2/3 older than her sister. In 6 years, she will be 4/5 older and in 15 years it will be 7/8. Both girls are under 10 years old. what are their ages? The width of a rectangle is 4 cm less than the length. The area is 350cm^2. Find the length and width.