exam Maths Puzzle Numerical Ability

46. B(2C �A)
Use the following matricies to compute above expression. State the dimensions of the resulting matrix.

[ 1 0] [3 -4]
A = [ 2 4]

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exam Other Question

2, 4 Express this following rational expressions in lowest terms, please!

4x^2 - 12x - 40 OVER 2x^2 - 16x + 30

wow... need help! thanks. How many four-digit numbers can be formed from the digits 0,1,2,3,4,5 if no repetitions are allowed and 0 cannot be the first digit?