exam Maths Puzzle Numerical Ability

What is the formula for this sequences of numbers?
60 50 40 30 20

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exam Other Question

how do you simplify x(squared) plus 4x over x(squared) minus 9x?

how do you simplify n(squared) plus 7n plus 10 over n(squared) plus 2n minus 15? i need to solve this system of inequalities by graphing, and then use a point on the x or y axis to check each solution the system is y>-x and y<x+6