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1210 to the power of five in scientific notation is 1.671 x 10^15
20 billion can be written as 2 x 10^10.
2 x 10^1 x 1 x 10^5 = 2 x 10^6
7.36 in the 5th power = 12.41 10 to the 5th power = 20 12.41 x 20 = 303.2
Deductive reasoning. You know that 10 x 10 is 100 and 20 x 20 is 400, so the square root of 225 is between 10 and 20. Only numbers that end in a five will create a square that ends in a five. 15 x 15 = 225