exam Maths Puzzle Numerical Ability

Factor
5ay+15a-xy-3x

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exam Other Question

How do you get the LCM?
{{{8+9}}}&{{{64-81s^2}}}&{{{8-9s}}} I do not fully understand the average rate of change. My book does not show an example of this question on how to proceed. Find the average rate of change of the function from x1 to x2:
f(x)=5x+7 from x1=-1 to x2=0

Thank you