please help number 4

label Mathematics
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schedule 1 Day
account_balance_wallet $5

Mar 31st, 2015

-6

first Option 

f(-1)= 3+1+3-1-3 =3

f(0) = -3

Average rate = (f(0)-f(-1))/1 = (-3-3)/1 = -6 


Mar 31st, 2015

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Mar 31st, 2015
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