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Answer 1

first convert to improper fraction:

a b/c=(a*c+b)/c

so it would be 5 1/4 *8/9 *8/21=21/4*8/9*8/21=(21*8*8)/(4*9*21)=simplify

Answer 2

first you need to simply all fraction into improper fraction, then do the multiplication , and simplify, the final answer. and it would be B!