exam Maths Puzzle Numerical Ability

3(2a+5)+2(3-a) ;a=4

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exam Other Question

The approach pattern to an airport requires pilots to set an 11o angle of descent toward a runway. If a plane is flying at an altitude of 9,500 m, at what distance (measured along the ground) from the airport must the pilot decend Can you please help me solve using the substitution method?

x + y = 1
x + y = 2