exam Maths Puzzle Numerical Ability

using the distance formula
how would u find a in the following problem
(-4,1)(a,8);d=square root of 50

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exam Other Question

PLEASE HELP ME WITH THIS!!
IF THE LENGTH OF THE SIDE OF A SQUARE IS INCREASED BY 6 UNITS, THE AREA IS MULTIPLIED BY 4. FIND THE ORIGINAL LENGTH. I need to solve the following systems of three equations
x+y+z=5
x-y+z=1
x-z=y+3
Thank you so very much