Which of the following simplifies to -9?

Question

Responses

−9−1
negative 9 minus 1

−4+13
negative 4 plus 13

−17 + 8
−17 + 8

− 2 + 7
− 2 + 7

Answer 1

−9-1, −4+13, and −17 + 8 do not simplify to -9. However, −2 + 7 simplifies to -9.