Answer:
20*
Step-by-step explanation:
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Answer: 60 years
Step-by-step explanation:
Let x denotes the age of Demochares .
Time he spent as a boy = 
Time he spent as a youth = 
Time he spent as a man= 
Time he spent in dotage= 13 years
As per given , we have the following equation:

[Take LCM]





Hence, he is 60 years old.
Answer:
557152
Step-by-step explanation:
You first multiply the 8 in 308 to the 9 in 1809, then the 0, then the 9, then finally the 1 in 1809. For the tens place, don't forget to put a zero under the ones place because that's not where you start. So for 0 everything is 0 so just put a line of 5 zeros in the second row. Lastly, the 3 multiplies to 9, 0, 8, and the 1 in 1809. In the 3rd row, put 2 zeros because you're multiplying to get the hundreds place. Line and add them all up to get 557152. Hope this helps!
(ab)2
((2)(5.1005020625)2=?
((2)(5.1005020625)2=20.402