Final answer:
To evaluate the expression x-(-y) with x = -2.31 and y = 5.9, substitute the values and simplify to get 3.59.
Step-by-step explanation:
The student has asked to evaluate the expression [x-(-y)] given specific values for x and y, where x = -2.31 and y = 5.9. To solve this, we need to substitute the given values into the expression and simplify.
First, we rewrite the expression by removing the parentheses and changing the signs appropriately:
x - (-y) = x + y
Now we substitute the given values:
-2.31 + 5.9
Then we add the two numbers:
3.59
Therefore, the evaluation of the expression x-(-y) with the given values is 3.59.