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Because the y values are the same, all we need to take into account is the difference in the length of the x values.
Answer:

Step-by-step explanation:
Given:

1.

2.

3.

4.

5.

6.

7.

8.

13 x 85 = 1105
78 + 91 = 169
169 / 1105 = 6.5
The answer is 515. Because 5×103 is 515