Question

So my first problem is:
(9.06 X 10-^5)(6.022 X 10^23)
I took 5 from 23 = 18 so that became 10^18 and 9.06 X 6.022=54.6 I assumed I move the decimal over so it becomes 5.46 to mach the choices
My answer choices are:
A. 1.51 X 10^18
B. 1.51 X 10^19
C. 5.46 X 10^18
D. 5.46 X 10 ^19
So I thought it would be C, and checked the key and it says it was D. Can someone tell me what I did wrong? If you can help with any of these that would be great! I have two more that I can't figure out what to do and I'll post them as a picture.

Answer 1

54.6 = 5.46 X 10^1
now you have 5.46 X10^1 X 10^18
10^1 X 10^18 = 10^19

Answer 2

number 8 G number 10 H

factor top (x-3)(x+2) factor bottom (2x-3)(x+2) simplify cancel (x+2)