Book Maths Puzzle Number System

How to do 4 square root of 7, times 3 square root of 6?

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Book Other Question

A copy machine makes 33 copies per minute. How many copies does it make in 5 minute and 40 seconds? A car travels a distance of 1742 miles at an average rate of 40 mph and returns at an average rate of 55 mph. Find the average rate for the roundtrip to the nearest tenth.