exam Maths Puzzle Numerical Ability

Simplify. (a^3)^6

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exam Other Question

I have two problems i am unable to do can you help.
thanks
Problem 1 Graph the inequality.
y >=3x

Problem 2
Graph the inequality.
2x + 3y > 6
a page in a book has an average of 25 words per square inch of paper. the average length of a word is 5.3 letters. what is the average number of letters per square centimeter of paper?