exam Maths Puzzle Numerical Ability

Multiply or divide the following rational expressions and express the results in the lowest terms

1) 16x^2/y^4 times 5x^2/y^2


2) 6x^5y^3/5z^3 times 6x^4/5yz^4


3) x

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exam Other Question
If a + b + c = 0, a^2 + b^2 + c^2 = 1, find a^4 + b^4 + c^4 Please help me with solving this equation. I came up with the answer 5/6 but I am not sure that this is right. 6x + 4(3x - 2) = 6x + 2. Thank-you