I HAVE TO GET THIS TURNED IN SOON! IT'S A FREE RESPONSE! Please answer correctly, and thank you!

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

One positive number is 9 more than twice another. if their product is 95, find the numbers

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest