book Maths Puzzle Numerical Ability

I'm haveing trouble with radicals. We have a quiz tomarrow and I am not understanding it even with the explanations and examples. I have three samples I hope you could tell me ho

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I cannot figure out how to work this problem: Find the value of k so that the slope of the line is 3/2. (2+k)x+(2-k)y=15 . Any help would be greatly appriciated. Can you please help to answer the following question:
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Sum the series:
1 x 2 x 3 - 2^3 + 3 x 4 x 5 - 4^3 + ... + 9999 x 10000 x 10001 x - 10000^3