Final answer:
The correct answer is to disagree, because the units are not compatible for addition without conversion. Ahmed and Zoe's strings, when converted to the same unit, do not add up to 3/6 of a yard but rather 5/18 of a yard.
Step-by-step explanation:
Disagree, because the units of measurement used by Ahmed and Zoe are not directly compatible for addition. Ahmed has 1/6 of a yard of string, while Zoe has 2/6 of a foot of string. To combine these measurements, we first need to convert them to the same unit. Since we know that 1 yard equals 3 feet, we can convert Ahmed's string to feet: 1/6 yard * 3 feet/yard = 1/2 foot. Now we can add Ahmed's converted string length to Zoe's: 1/2 foot (Ahmed's string) + 2/6 foot (Zoe's string) = (3 + 2)/6 foot = 5/6 foot, which is not equal to 3/6 yard. To express this sum back in yards, we would need to divide by 3, which gives us 5/18 yard — still not 3/6 yard. Therefore, the correct answer is D. Disagree, because the units are not compatible for addition without conversion.