exam Maths Puzzle Numerical Ability

A bookstore offers wireless Internet access to itscustomers for a charge.The cost is $1.50+m over 20,m=# of minutes.
How much would it be for 40 minutes?

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Hi,
I need help with this problem: {{{3x^3-4x=1}}}. I'm unsure how to factor it because of the cube. I moved the one to the other side and tried to factor it, but found i couldnt
A pool measures 20 feet by 30 feet. It is surrounded by a walkway which is same width around the rectangular pool. With the walkway, the area is 1500 square feet. What is the width of the walkway?
(a teacher generated question, not from textbook.)