book Maths Puzzle Numerical Ability

simplify the complex fraction : Rt=1/((1/R1)+(1/R2)+(1/R3))

in R1, R2, and R3 1,2, and 3 are subscripts

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book Other Question

I need help with this problem it says: Determine the symmetry with respect to x axis, y axis and origin if any exists. abs(y) = -x Thanks. what is the discriminant in the quadratic equation?
x2 + 11x + 121 = x + 96?
thank you