520 = 9.536743164*1013 in scientific notation
According to the calculator built-in to Windows... 5 to the power of 20 is...95,367,431,640,625 !
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m^4 n^5 - m^20 n^21
The units digit of any positive integer power of 5 is 5. The complete number is: 95367431640625
Solve the exponent first and then subtract it! Ex 5 to the 2 power-20 5 to the 2power = 25-20=5!!
The answer is 2,625
(5)21 x (4)11 = (5)11 x (5)10 x (4)11 = (5)10 x (5 x 4)11 = (5)10 x (20)11 =(5)10 x 20 x (20)10 = 20 x (5 x 20)10 = 20 x (100)10 = 2 x (10)1 x (10)20 =2 x (10)21 = 2,000,000,000,000,000,000,000