The answer is A, Callie incorrectly placed the decimal. The correct answer to the equation would be 19.886
-7+1/-4+2 is -6/-2 which is 3
You multiply 5 times 10, which gives you 50. This is the length of one side. Since it's a square, all sides are the same length.
Answer: 50cm x 50cm
Expressions are problems with no answer. I would use it to represent inequalities and/or a basic formula
