book Maths Puzzle Numerical Ability

Dear Tutor,
How do you write an equation that shows the relationship between two numbers?
Thank you

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book Other Question

How long would it take and SR71 blackbird to travel 5570 miles, if it travels at an average speed of 2228 mph? (1) simplify: ( sqrt 7 + sqrt 2) (sqrt 7 - 3 sqrt 2)




(2) simplify: sqrt 72 x^5 y^7