For what value is the fraction 15-x/x+1 undefined?

-1

Step-by-step explanation:

if x is equal to -1 then it will be like this

15-(-1)/-1+1 ➡ 16/0 a number divided by 0 is undefined.

x = -1

Step-by-step explanation:

I think you mean (15 - x)/(x + 1).

If so, then the denominator cannot equal zero.

Set the denominator equal to zero, and find x.

That will be the x value that makes the fraction undefined.

x + 1 = 0

x = -1

x = -1

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)