exam Maths Puzzle Numerical Ability

To prove triangle DEF is congruent to triangle GHK by the SSS Postulate, you must first show that ___, _, and ___.

Please help. I don't get what they are asking for th

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exam Other Question

Solve the system of equations: (hint: let (1/x)=t and (1/y)=u)

(2/x)+(1/y)=11
(3/x)-(5/y)=10 Add. Simplify by collecting like radical terms if possible. Assume that all expressions under radicals represent non-negative numbers.

root( 3, y ) + root ( 6, y )