exam Maths Puzzle Numerical Ability

3/ratical of 7+5

please help me rationalize the denominator!

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exam Other Question

I really need help with this problem. will someone please help me? I think I left a number out of this problem earlier. y=-1/3x+2 find all the values of x satisfying the given conditions
1 2 -4
y1= --- , ----, ---------, and y1+y2=y3
x+7 x+3 x^2+10+21