book Maths Puzzle Numerical Ability

One spring stretches 6in when a 32-lb weight is hanging on it and a 9in when a 48-lb weight.Find the slope of the line that models the stretch(s)of this spring depending on weight,

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book Other Question
5-3[4-(5 + 2)] - 9 how do i find the volume and surface area of a sphere when i am NOT given a radius or diameter, only a height off to the side of the sphere?