exam Maths Puzzle Numerical Ability

fourteen is three times the difference of a number and 6. write an equations
14 = 3(x - 6)

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exam Other Question

Please solve this problem: (3x-2y)squared

Answer sheet says it 9x squared+4y squared-12xy.

I understand the 9x squared + 4y squared but not the -12xy.

Thanks,

S If you bought 850 Douglas firs and ponderosa pines and paid an average of $300 for douglas firs and $225 for ponderosa pines and the total you spent was $217,500 how many of each tree did you buy?