a) 5 ^8 *b ^ 7 /(25)^3 x b^4
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(25)^3 x b^4
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Step-by-step explanation:
5^8*b^7\25^3*b^4
=5^8*b^7/5^6*b^4
=5^8-6*b^7-4
=5^2*b^3