9r2
12√3r
13r
√13r
Correct answer is C
√160r2+√71r4+√100r8
Simplifying from the innermost radical and progressing outwards we have the given expression
√160r2+√71r4+√100r8 = √160r2+√71r4+10r4
= √160r2+√81r4
√160r2+9r2 = √169r2
= 13r
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