Describe how to round 678 to the nearest hundred

First you look at rhe number to the right of the number being rounded to . So in your case, the number you look at is 7. Sins0ce 7 is more than 5, you round the 6 up so it becomes 7 and your digits after the 6 (now a 7) become Zeros. So your final answer is 700

2xy/9 is the answer to this problem

The answer will be y=-5+0 because the slope is -5 and the it has to go through y-axis 0