exam Maths Puzzle Numerical Ability

Evaluate 4sqrt81, if possible. The sqrt of 81 is 9 so would it be 49=36?

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exam Other Question

For an ellipse with foci (0,+or-1) and a major axis with length 6.
a) Explain in 1-2 sentences how you decide if this ellipse is horizontal or vertical.
b) In 3-4 sentences, e how would you solve {{{x^2+7/8x-x/8}}} and {{{a+a/5+2/5a}}}