exam Maths Puzzle Numerical Ability

Find the slope of the line through the following pairs of points (-3,5) and (2,10)

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exam Other Question

I was not sure what type of problem this would be so I put what i thought was close.

Which of the following relations represents a function?
a. (0,4) (0,-3) (1,-2)
b. (1,1) (1,2) (1,3)
c. (2,-1) (2,1) (2,3)
d. (-1,2) (1,2) (3,2) a rectangular swimming pool is three time as long as it is wide and is surrounded by a deck 2.5 m wide. find the dimensions of the pool if the area of the deck is 265 m^2