2m + n = 2
3m - 2n = 3

m = 1   n = 0

Step-by-step explanation:

(2m + n = 2)2              You need to cancel out one of the variable, so I chose n

3m - 2n = 3

3m - 2n = 3            

4m + 2n = 4              Add the two equations together

7m = 7                       Divide both sides by 7

m = 1

Plug 1 in for m into one equation

2(1) + n = 2

2 + n = 2        

-2       -2                     Subtract 2 from both sides

n = 0

Check this with the other equation to make sure it is the same answer

3(1) -2n = 3

3 - 2n = 3

-3        - 3                    Subtract 3 from both sides

-2n = 0                        Divide both sides by -2

n = 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)

step-by-step explanation: