exam Maths Puzzle Numerical Ability

IS (SQRT X)^2 AN IDENTITY ( TRUE FOR all NONNEGATIVE VALUES OF X ^2)EXPLAIN

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exam Other Question

mr c can type 66 words in 1.5 minutes. at the same rate how many words can he type in 3.5 minutes? A boat can travel 5 miles upstream and 5 miles downstream in a total of 6 hours. If the speed of the current is 2 miles per hour, what is the speed of the boat in still water?