Nonpermissable replacement for a in 4/-9a

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

Which of the following is the true for f(x) = 5cos

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy