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OpenStudy (anonymous):
125r^3=8
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Directrix (directrix):
125r^3=8 --------- 125 r^3 = 5r * 5r * 5r = (5r)^3 and 8 = 2*2*2 = (2)^3 So, 125r^3=8 becomes (5r)^3 = (2)^3 Note that the two expressions have the same exponent but a different base. What is true about (5r) and (2)? @destmath123
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