Answer:
Choice D is correct.
Step-by-step explanation:
We have to find sum of x and y.
Sum of x and y means to add the values of x and y
Given values of x and y are
x=3.1 , y=5.4
Sum of x and y=x+y
x+y=3.1+5.4
write down the numbers,one under the other,with the decimal points, add using column addition
3.1
+5.4
8.5
x+y=8.5 which is the answer.
