book Maths Puzzle Numerical Ability

How do I multiply and write the result in simplest form of 2 over 9 . 4 over 5?

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book Other Question

7x + 5y = 13
3y - x = -13 How do I make a graph to show it with four different quadrants. I have to be able to graph inequalities for example 4x+y>4. Can you please help me? Then I need to know how to graph