exam Maths Puzzle Numerical Ability

Simplify
[4(9-6)-1]-6-(5-4)]

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exam Other Question

When a rock is dropped from a cliff into an ocean, it travels approximately 16t squared feet in t seconds. If the splash is heard 4 seconds later and the speed of sound is 1100 ft/sec, approximate the height of the cliff. 1. Prove that, for square matrices A and B, AB = BA if and only if (A - B)(A + B) = A^2 - B^2

2. Solve the equation XA^2 = A^-1 for X, assuming all matrices involved are inverti