The answer is 4.71*10^-7.
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4 billion/10 million = 4 x 109 / 10 x 106 = 4 x 109 / 107 = 4 x 102 = 400
(109) x (107) = 10(9+7) = 1016which is equal to 10,000,000,000,000,000
2,000,000,000 can be written as:2.00 × 109 in scientific notation(2 x 109) + (0 x 108) + (0 x 107) + (0 x 106) + (0 x 105) + (0 x 104) + (0 x 103) + (0 x 102) + (0 x 101) + (0 x 100) in expanded exponential notation.
501 x 501 = 251,001
109 x (1 - (30/100)) = 109 x 0.7 = 76.3. If the number refers to a unit of currency, don't forget to round to the appropriate number of decimal places and include the appropriate currency symbol.