book Maths Puzzle Numerical Ability

Name the operation in this expression -xy also x(-y) and -x-y.

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book Other Question

Two trains start toward each other on parallel tracks at the same time from towns 450 miles apart. One train travels 6 mph faster than the other train. What is the rate of each train if they meet in 5 hours?
thanks for the help! Let M_22 describe the vector space of 2 x 2 matices:
a) What is the dimention of M_22? Support your answer by givins a basis for M_22.

b) Let L:M_22-->M_22 be the linear operat