exam Maths Puzzle Numerical Ability

My teacher came up with this problem.
You must multiply the matrices.

[ 2 0 1] x [-2 3]

[-3 4 0] x [4 -1]

x [

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exam Other Question

1. (2x + 7)(-3x^2 + 11x - 8)
2. 3x(-4x2 + 5x + 14)
3. (7x^3 + 3)(6x^5 - 2)
4. (3/4X^3 - 1/3)(1/5X^2 + 3/7)
5. (7x^3 - 11x^2 + 2x)(-4x^2 - 5x + 8)
6. (7x - 5)^2
7. (3x + If there are 6 x10^9 people on the Earth and there is enough freshwater to provide each person with 8.79 x10^5 L, how much freshwater is on the Earth?