exam Maths Puzzle Numerical Ability

simplify

(a^-1 + b^-2)^-1

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Im doing distance learning and im having trouble with 2 questions on the TMA, could you help please
Determine f ' (x) if (t) = G(1 - e^-kt)
Determine f ' (y) if f (y) = exp(3 - 1 I need the y= mx+b equations for these lines:

Line 1: -8x+13y+1 = 0
Line 2: -12x+11y+27 = 0



Thanks gang