book Maths Puzzle Numerical Ability

f(x) = 3x^+2x-4

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book Other Question

A)The tour de France is a famous cycling race held each year. the 2001 race included 20 parts or stages of various lengths for a total of 3453km. Stage 17 ran from Brive-la-Gailla If a regular polygon has an ecterior angle of 18 degrees, how many sides would that polygon have?

and

If a regular polygon has an interior angle of 135 degrees, how many sides would that polygon have?

Please help me
Reanne