exam Maths Puzzle Numerical Ability

Hi!!
Please help me with this question
How many mm2 are in 3cm2. What is the ratio of cm2 to mm2 ?

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exam Other Question

A-5 On an oblique triangle solve a=96in., b=58 in., B=30 degrees.
I know the answer is A=55.9 degrees, C=94.1 degrees, c=116 in, but I cannot get it to come out right. I sure would appreciate help. THANKS Find the solution to the system using Gaussin Elimination Method:

2x + 2y + 4z = 40
0x - 2y + 2z = 12
2x + 3y + 3z = 34

answers are real, whole numbers.