exam Maths Puzzle Numerical Ability

Perform the multiplications. Assume that all variables are positive.
y^2/5(y^-2/5+y^3/5)

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exam Other Question

The combined resistance of two resistors R1 and R2 in a
parallel circuit is given by the formula

Rt= 1 divided by 1/r1+1/r1 simplify the formula. woosh over my head! divide: 3x^3-5 by x-1