Final answer:
Polly used 2 1/2 ft of ribbon to wrap her mom's birthday present. She has 5/6 ft of ribbon left.
Step-by-step explanation:
To find out how much ribbon Polly used, we need to multiply the total amount of ribbon by the fraction she used. Polly used 3/4 of the ribbon, so we can multiply 3/4 by 3 1/3. When we multiply these fractions, we get (3/4) * (3 1/3) = (3/4) * (10/3) = 30/12 = 2 1/2 ft. So, Polly used 2 1/2 ft of ribbon to wrap her mom's birthday present.
To find out how much ribbon Polly has left, we can subtract the amount she used from the total amount. The total amount of ribbon Polly had was 3 1/3 ft. She used 2 1/2 ft, so we can subtract 2 1/2 from 3 1/3. When we subtract these fractions, we get (3 1/3) - (2 1/2) = (10/3) - (5/2) = (20/6) - (15/6) = 5/6 ft. So, Polly has 5/6 ft of ribbon left after wrapping her mother's gift.