exam Maths Puzzle Numerical Ability

how would i do this? Simplify the following fractions by putting them in lowest terms or by performing the indicated operations

81-x to the 4th over 3-x divided by 9+x2 over 9 =

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exam Other Question

The edges of a saw tooth are 1.39mm and 3.26mm long. The base of the tooth is 2.05mm long. At what angles do the edges of the tooth meet? Can you please explain the foil system to me I didnt understand it in school?

Thank you,