So she has used two kinds of sugar, brown and powdered.
She used \(2 \frac{3}{4}\) cups of brown sugar and \(1 \frac{3}{4}\) cups of powdered sugar: we need to add the two numbers:
\(2 \frac{3}{4}\)+\(1 \frac{3}{4}\)= 2+1+\(\frac{3}{4}+ \frac{3}{4}\)=3\(\frac{6}{4}=3+1+ \frac{2}{4} =4 \frac{2}{4}=4 \frac{1}{2}=4.5\)
so the correct answer is 4.5
