In Step 1, the student should have used 1 half x to represent Nadra’s age, and written the equation open paren x plus 3 close paren plus x plus 1 half x is equal to 33 .
B
In Step 2, the student should have added 3 on both sides of the equation to find a solution of x is equal to 9 .
C
In Step 3, the solution represents Sadie’s age. Therefore, Sadie is 7 and 1 half , Kareem is 4 and 1 half , and Nadra is 2 and 1 fourth .
D
In Step 3, Nadra’s age is the difference between 33 and Sadie’s and Kareem’s ages, so Nadra is 15 .