book Maths Puzzle Numerical Ability

What is the difference in elevation between the higest point in California,Mount Whitney,which towers ,4421 meters above sea level,and the lowest point in Califorina,Death Valley,w

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How do I express in simplest radical form.

6 square root of 7 * 3 square of root 5

Do I first need to get a common number?

30 square root of 35 * 21 square root of 35 2 investments made produce an annual income of $4200.amount invested at 14% is $6000 less tha amount invested at 10%. find amount invested at 14%