Step-by-step explanation:
All you need to do is isolate the variable
For Addition, if the signs are the same, you add and keep the sign. And if they are different, you subtract and keep the sign of the greater absolute value.
For Subtraction, You change the subtraction sign to the addition one and then follow the rules of addition, above.
Answer:
The prices decreased from $245,000 to $215,000. This is about a (I don't know this one)
The answer to these blanks are :
1. 6 (m)
2. 1 (s)
3. 0 (m)
4. 4 (s)