Answer:
C) 14 1/2
Step-by-step explanation:
To find the best estimate of the sum you need to round each fraction to the nearest whole number and then add them together.
So first you need to convert 31/4 to a mixed number by dividing 31 by 4, which is 7 3/4.
Then you need to round 7 3/4 to the nearest whole number which is 8.
Then you need to convert 17/3 to a mixed number by dividing 17 by 3, which is 5 2/3.
Now you round 5 2/3 to the nearest whole number which is 6.
Then we have 8/18 so first we reduce it to its simplest form which is 4/9. 4/9 can be rounded up to 1/2.
Finally add the numbers you rounded
So, 8 + 6 + 1/2 = 14 1/2
So the best estimate of the sum is 14 1/2.
