Step-by-step explanation:
[tex] - \frac{9}{12} - ( - \frac{7}{4} ) = - \frac{3}{4} + \frac{7}{4} = \frac{4}{4} = 1[/tex]
First we need to reduce then we add the similar fractions
In second step you can see that -7/4 become 7/4 the reason for that is the negative sign in front of parenthesis
When two numbers multiplied it gives out a positive number therefore - (-7/4) which is also can be written as -1 × -7/4 = 7/4.
