Question 348675
Hi.
*Note: when the bases are the same, you find the new power by just adding the exponents:
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If I am understand your question properly

{{{4*5^(6+11)*5^(4+9) }}}
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common base of 5
{{{4*5^(6+11)*5^(4+9)=4*5^17*5^13 }}}
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{{{4*5^17*5^13 = 4*5^(17+13)}}}
{{{4*5^30}}}