Answer:
Step-by-step explanation:
The given expression is
[tex]7\frac{1}{4}-3\frac{3}{4}=4\frac{2}{4}=4\frac{1}{2}[/tex]
We can rewrite the expression as
[tex]\frac{29}{4}- \frac{15}{4}= \frac{18}{4}= \frac{9}{2}[/tex]
When we subtract expressions on the left
[tex]\frac{29-15}{4}=\frac{14}{4}[/tex]
While Toby's result after solving this is [tex]\frac{18}{4}[/tex]
Therefore, Toby has done a mistake in this step.
[tex]7\frac{1}{4}-3\frac{3}{4}=3\frac{2}{4}=3\frac{1}{2}[/tex] will be the answer.
