Which number produces a rational number when added to 0.5

C.

Step-by-step explanation:

Adding any two rational numbers gives another rational number (closure property).

This means that the correct answer is a number from the given option that is a rational number.

The only number that is a rational number among the given options is -3.5

Therefore the correct answers is C

See attachment for the complete question

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm