Find all numbers for which the rational expression is not defined!

5/x+8

So I'm assuming we need the denominator to be 0. The only number that will satisfy this is -8.

x = -8.

Step-by-step explanation:

The reason is we need the denominator to be 0. The only way is -8 + 8 which is 0.

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)