Answer:
1:3
Step-by-step explanation:

Answer:
D correct
Step-by-step explanation:
When rounding a number, the digit of the number can be increased up to 1, but the digit won't be decreased. So, it is possible to round a five digit number into six digit number. But to increase the number digit, the number should be rounded up. To be rounded up, a number should have value 5 or more.
I'm not sure what some of the ordered pairs are in what you wrote, but a function is when each input has one output. So, for every x there is one y. The x values can not repeat. So, remove one of two ordered pairs where the x value is repeating.
For the first one it would be:
C(800)=600
The second would be:
C(200)=e
And the third would be:
C(s)=900