exam Maths Puzzle Numerical Ability

Hello, how do i simplify (9 - 5i)(1 + 3i)

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exam Other Question

Here are 2 superficies . The first one has 200 hectars and the second one 45 hectars.How much hectars of each superficie have to be cultivated for the wheat if in the first superfi A Dodecahedron is composed of how many regular polygons?

thanks^_^