The solution to 4.2x = 19.32 is x = ___. 0.28 0.45 4.6 15.12

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

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Plz hurry evaluate the expression a+b where a=8 and b=19