Respuesta :

alessandracruz

Answer:

[3/4 + (-5/7)] = 1 /28

≅ 0.03571429


Step-by-step explanation:

[tex]\bf \cfrac{3}{4}+\left( -\cfrac{5}{7} \right)\implies \cfrac{3}{4}-\cfrac{5}{7}\implies \stackrel{\textit{our LCD will then be 28}}{\cfrac{(7)3~~-~~(4)5}{28}}\implies \cfrac{21-20}{28}\implies \cfrac{1}{28}[/tex]