Thirty million three hundred forty three thousand one hundred and fifty four in number form

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

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Is a positive integer raised to a negative power always positive