exam Maths Puzzle Numerical Ability

i need to find the diaganol of my computer monitor using a^2+b^2=c^2
L=13"
W=8"
D=????

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exam Other Question

solve (u-10)2power -32=0 u is a real number a= 6-j8 ; b= 5+j12 ; c= 5+j8.66


b/ja-c= ??


ab + c/j5 =??

Please help I need a refresher have not done this in over two years