exam Maths Puzzle Numerical Ability

i have to use the midpoint formula and i have the midpoint and one end and i have to find the other end

ex) A------B------C
(2,-3) (-5,1) (?)

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exam Other Question

how do i factor this completely?

x^2-36
A family swimming pol holds 60m cubed of water. The function f(x)=60-0.18x gives the cubic meters of water in the pool, taking account water loss to evaporation over x days. whats