exam Maths Puzzle Numerical Ability

subtract
2x/x^2 - 13x + 42 - 7/ x-6

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exam Other Question

The combined resistance of two resistors in a parallel circuit is given by the formula

RT=1/(1/R1+1/R2)



Simplify the formula.
find the slope for the ling passing through the two given points:
A = 7,3 B= -2,5