Answer:
-3
Step-by-step explanation:
First take (-3+2) and simplify that which will turn into (-1). Then take (-5+7) which will turn into (2). Then plug that back into the equation and you get (-1)-(2). And you get -3.
The answer is 0.5778 or 0.578 rounded
3 times 219 is 657 so you need 6 hundred value blocks 5 ten value blocks and 7 one value blocks