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My best guess would be 25. im not sure tho but its the only one that seems right
apologiabiology
complement means addds to 90

R=30


the complementary angle to R means what plus R=90

what+R=90
what+30=90
minus 30 both sides
what=60

the complment of R is 60 degrees, it is not listed

answer is none of the above

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good job