book Maths Puzzle Numerical Ability

A computer can execute 36 instructions per microsecond. How many instructions can it execute in 4 minutes?

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book Other Question

Show that the statement is sometimes true. Then give a counterexample to show that the statement is not always true.
|x|=x

|-x|=x

|x+y|=|x|+|y| The slope is 1 ; the y-intersept is 0