exam Maths Puzzle Numerical Ability

Please help with the following:

State a function for the following:

x= 1,2,3,4
y=20,16,12,8

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exam Other Question

A rectangular painting with a width of x centimeters has an area x^2 + 50x square centimeters. Find a binomial that represents the length. six years ago bob was four times as old as mary. in four years he will be twice as old as mary. how old are they now? use a system of equations.