Whats the missing information?

The rest of the months.

Step-by-step explanation:

The x-line shows Months of the Year. However, only 6/12 are provided. Therefore, the rest of the months would be the answer.

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

the furthest the dog can be is 508 meters away from the house, and the closest he can be is 492 meters away from the house.