document.write( "Question 888130: If 5²×5⁴×5⁶×…×5²ᵃ=(0.04)⁻²⁸,how to determine the value of a? thanks u so much tutor ^^,it is a arithmetic progression.\r
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Algebra.Com's Answer #537087 by luke94(89)\"\" \"About 
You can put this solution on YOUR website!
trial and error to achieve your answer:\r
\n" ); document.write( "\n" ); document.write( "(0.04)^-28 = 1.3877787807814456755295395851135e+39 or 1.4x10^39\r
\n" ); document.write( "\n" ); document.write( "having known that keep punching numbers in till you get the same answer which is 5^56 and in the question as stated is 5^2a divide 56 by 2 and your value of a is 23
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