Answer:
1) My friend is wrong because [tex]\frac{3}{1} *\frac{4}{7} = \frac{4*3}{7*1} =\frac{12}{7} [/tex]
2) [tex]3\frac{2}{3} *2\frac{2}{3} =\frac{11}{3} *\frac{8}{3} =\frac{8*11}{3*3} =\frac{88}{9} =1\frac{7}{9} [/tex]
3) First friend is wrong b/c they multiplied both numerator and denominator by 3. The second friend is wrong because they didn't multiply in mixed fraction.
Sorry for the confusion while answering the last question.
