first, the 10 * 23 = 230. times by the six in the parenthases is 1380. 1380 * 6 = 8280
if you mean 6(6*10^23) then the answer would be 3.6x10^24 because 6x6 is equal to 36 and to simplify it to only one decimal place, you just add one 10 to the power of 23 to make it 10^24 and now all you have to do it move the decimal place on 36 one unit to the left making your final answer 3.6x10^24. Hope this helps. :)
