exam Maths Puzzle Numerical Ability

please solve these two numbers by factoring completely:

1. 9 - (2a + b)^4

2. 32a^4b - 162b^5

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exam Other Question

Find the amount that will result if $9000 is invested for 2 years at 12% compounded continously? multiply and write each answer in simplest form
4 1/5 x 10/21 x 9/20