exam Maths Puzzle Numerical Ability

Word problem - HELP!!

You have 15 paint colors to choose from. There are only four rooms in the house that need painting - in how many ways can you choose which color paint to use??
Makes no sense - help
Thanks

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exam Other Question
Factor completely. Use ^ to denote exponents, parentheses and do NOT use spaces.
x^3+27 what are the standard forms to be used in the solution of the following equation by determinants

5x=2y+8
2x-26=-3y