exam Maths Puzzle Numerical Ability

I wasn't sure where to categorize induction but I'm really confused on these two questions.
1) Using the Principle of Mathematical Induction, verify that
For every integer n &

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How many bushels from a mixture that is one third oats must be added to 480 bushels of mixture of corn and oats which is 75% corn in order to get a mixture which will be 30% oats? Find the vertex, focus, and directrix of the parabola given by each equation. Sketch the graph.

18. 3x+y^2+8y+4=0