exam Maths Puzzle Numerical Ability

Find the surface area of a right triangular prism.

8ft and 10ft. and 6ft and 8ft.

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Please help! I don't understand how to put the following 2x2 matrix in matrix form. I know how to augment the matrix, but i cant solve it. I know the augmented answer is [-5 7 | Help!
8000=10,000(1/1+r) the () is raised to the 2.5 power?