9. Which of the following equations has NO solution? A. a + 2 = a + 2
B. a = -a + 2
C. a + 2 = a - 2
D. a + a = 2

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers