exam Maths Puzzle Numerical Ability

Find the midpoint between these points:
(-3, 7) and (4, -5)

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exam Other Question

Hi its me again, I have another problem, thank you.
(5^8)^4
_______

(5^7)^4

I first expressed 5x5x5x5x5x5x5x5, then I expreseed 5x5x5x5x5x5x5, I must say Iam lost at this point 1/4-^^^+3^^/2-^