Ok so first lets do A. Her measurements are not correct the actual double is 1 cup of sugar and 3 1/2 cups of flour Explanation: 2=2/1
Multiply 1/2 by 2/1 you get 1 Change 1 3/4 to an improper fraction and do the same Multiply 7/4 by 2/1 you get 14/4 which equals 3 1/2
Now B. She would do the same thing but with three instead so
1/2x3/1= 3/2= 1 1/2 7/4x3/1= 21/4= 5 1/4
Now C the process for changing a mixed number into an improper fraction is you multiply the whole number by the denominator and add it to the numerator.