Question

Really do not get this, please help!

Answer 1

a) 11/6 and b) 5/21.

To solve this problem we have to do fraction operations. To sum and substrac fractions with different denominators with use the following formula $\frac{a}{b} +\frac{c}{d} = \frac{a.d+b.c}{b.d}$ for the sum and $\frac{a}{b} -\frac{c}{d} = \frac{a.d-b.c}{b.d}$ for the difference.

a) $\frac{3}{4} +\frac{5}{6} = \frac{(3)(6)+(4)(5)}{(4)(6)}=\frac{24+20}{24}=\frac{44}{24}= \frac{11}{6}$

b) $\frac{4}{7}-\frac{1}{3} = \frac{(4)(3) - (7)(1)}{(7)(3)}=\frac{12-7}{21}= \frac{5}{21}$

Answer 2

A) 1 7/12 or 1.6
b) 5/21