A(t)=100(0.8)t

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Solution for A(t)=100(0.8)t equation: 



(A)=100(0.8)A

We move all terms to the left:

(A)-(100(0.8)A)=0



We calculate terms in parentheses: -(100(0.8)A), so:

100(0.8)A

We multiply parentheses

80A

Back to the equation:

-(80A)



We add all the numbers together, and all the variables

-79A=0

A=0/-79

A=0

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