exam Maths Puzzle Numerical Ability

HOW DO U FIND THE SLOPE AND Y-INTERCEPT OF A LINE WRITTEN IN THE Y-FORM?

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exam Other Question

Tell wether the number is prime or composite. If it is composite,write its prime factorization.

7.163

Any help with this equation would be GREATLY appreciated.
How many combinations of room decoration can you create with 12 wall papers, 7 floors and 5 drapes? What equation do I need to use to solve this problem? What would be the proof?