book Maths Puzzle Numerical Ability

Is there a way to find out how stretchable a rubber is eg rubber band? If so, how do I do that? Thank you

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book Other Question

What is the slope of the points (4,2) (-5,2)

i got 0/-9.. do i leave it that way or is the slope 0??

Thanks Caroline Find the value of x in the equation
The square root of x+5=the square root of x+45?