exam Maths Puzzle Numerical Ability

sequences and functions what are the missing operations?5,1,6,10-add4-?-5,1,6,10

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exam Other Question

What are the steps to solve the following problem

9-2m/7= 19

Is this correct

9-2m/7 = 19
=(9)-9 2m/7 = 19-9
=-2m/7 = 10

I do not know rather this is right or wrong pl Using synthetic division, determine whether the numbers are zeros of the polynomial.
5, 0; f(x)=2x^4-8x^3-15x^2+30x-25