exam Maths Puzzle Numerical Ability

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

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exam Other Question

Solve by using the quadractic formula.

x^2=7x+6 A plane which can fly 100 miles an hour in still air can fly 500 miles with a wind which is blowing at a certain rate in 5/8 of the time it would require to fly 500 miles against a wind blowing at the same rate. What was the rate of the wind?