The logarithm of 20 to the power of 2 is written as log(20^2). Using the power rule of logarithms, this can be simplified to 2log(20). Further simplifying, the logarithm of 20 is approximately 1.3010 (to 4 decimal places), so 2log(20) is equal to 2*1.3010 = 2.6020.
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20 to the second power is more commonly known as 202 or 20 squared. Squaring is calculated by taking two of the number and multiplying them together. In this case, 20x20=400 and so 20 to the 2nd power is 400.
It equals 200 because 20x20 equals 200
Calculate the powers, and do the addition. For example, the second power of 4 is the same as 4 x 4 (you are supposed to multiply 4 by itself).