I need math help pls! I don't know how to do most of these, especially confused on #5. I have put this in 4 times.

1=U

2=I

3=E

4=T

5=A

6=C

7=D

8=P

9=U- 1.17x10^-9

10=K

Step-by-step explanation:

A) 3.487*10^-5

Step-by-step explanation:

Adding 3.48*10^-5 to 7*10^-8 is just adding 0.0000348 to 0.00000007, so it's just adding a 7 on to the end of 3.48*10^-5

i dont know just jot down something but i dont care let me submit this

Step-by-step explanation:

listen if u are not taking the test just blop something down and they dont look at the awnser if they do then i dont know friendly hint