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http://prntscr.com/l1t384

 Oct 3, 2018
 #1
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The exponent   3/7    means   raise everything to the  3 'power' and then take the '7th' root....

....so first choice is no good (cube root or 3rd root)

 

5^3 = 125  so the 3rd choice looks good

(x^3)^3 = x^9    so the third choice still looks good

(y^4)^3 = y^12      so the third choice it is!

 Oct 3, 2018

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