Which of the following math statements contain variable(s)? Check all that apply. A. 11 - X = 9
B.6-6=0
C. ? + 1 =5
D. 4+6 =10

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

How to do this , and can some one explain

What are the solutions of the equation? 5z^2 + 9z - 2 = 0 a. 1, -2 b. 1, 2 c. 1/5, -2 d. 1/5, 2