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w: 6√5 / √3 * √3/√3 = 6√15 / 3 = 2√15
z: 5√3 / √5 * √5/√5 = 5√15 / 5 = √15
w>z
b.
w=3/√3 * √3/√3 = 3√3 /3 =√3
z =4/√2 * √2/√2 = 4√2 /2 = 2√2 = √8
w<z
c.
w=4√3 / √2 * √2/√2 = 4√6 / 2 = 2√6
z =14 / √7 * √7/√7 = 14√7 / 7 = 2√7
w<z
d.
w=6√5 / √2 * √2/√2 = 6√10 / 2 = 3√10 = √90
z=10√3 / √5 * √5/√5 = 10√15 / 5 = 2√15 = √60
w>z