9514 1404 393
Answer:
see attached
Step-by-step explanation:
The sum is formed by adding corresponding elements. For example, the lower right element (row 3, col 3) of the sum is 5+4 = 9
Parallel lines have the exact same slope ( or else they would eventually run into each other). So the answer is -1/2 is the slope.
35 / 5 = 7 ; also 49 /7 = 7
So
? = 8 x 7 = 56
Answer
Missing side length = 56
70 Miles = 112.65408 Kilometers