book Maths Puzzle Numerical Ability

Hi I have not a clue how to do any of the proportions and I have a test this coming week! We have all of this proportions and tax-n-tip things and I feel as if I am the only one in

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Solution for x:

1 = sqrt(1-x^2)

What is the proper technique for solving x?

Thanks! Solve. The land area of China is 3.692 x 106 square miles, and that of India is 1.18 x 106 square miles. What is the total land area of China and India expressed in standard notation?