What is -2 + something = 10

12.

Step-by-step explanation:

It is simple. If you look at the answer and think "If I'm at -2 on a number line, how many am I going to count to get to 10? Try looking up a number line or making one. You can also take the answer plus the -2 that you have to equal 12. Hope this helps.

450 is the final answer! : )

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)