Final answer:
The student's answer to the simplified expression is incorrect.
Step-by-step explanation:
The student simplifies the expression (10 + 7r - -2) + (-6r^2 - 18 + 5r). In order to check whether their answer is correct, we need to simplify the expression and compare it with their answer.
By combining like terms, we have (10 + 7r + 2) + (-6r^2 + 5r - 18) = 12 + 7r - 6r^2 + 5r - 18 = -6r^2 + 12r - 6.
Based on our simplification, the student's answer is incorrect.