exam Maths Puzzle Numerical Ability

Help solving this problem; y-2-8 sqrt(y-2) +15= 0

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how do you write 2.78 x 10^7 in standard notation? hi.i dont get how to find the second midpoint with the given midpoint, here is my question....T(6,2) [[this is 1st endpoint]]M(2,0)[[this is midpoint]] ???what is the 2nd endpoint.