book Maths Puzzle Numerical Ability

how do you multilpy the matrices

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Population Growth Problem:
In the year 2000, population on a small S. pacific Island was 38,000. By the year 2003 this figure grew to 45,000. Assuming that the population is growi Given f(x)=4x-3 and g(x)=2x(to the power of 2)-5 find f[g(-1)] and g[f(-1)].