exam Maths Puzzle Numerical Ability

The combine resistanc of two resistors R1 and R2 in a parellel circuit is given by the formula

Rt = 1/ 1/R1 + 1/R2

Simplify the formula

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exam Other Question
eNRIQUE POTS 12% OF HIS MONTHLY PAYCHECK IN A IRA. IF HE INVESTS $72 IN HIS IRA, HOW MUCH WAS HIS PAY CHECK Solve using the quadratic formula:
x^2 – 7x – 1 = -7