Question

Terence's spending account balance is represented by the formula A ( t ) = 100 ( 0.9 ) t , where t is time elapsed in weeks. What will his account balance be after 2 weeks? A. 41 B. 45 C. 81 D. 90

Answer 1

Answer:

C. $81

Step-by-step explanation:

To find out how much money would be in Terence's account balance after 2 weeks, we can use the formula provided to us.

$A(t)=100(0.9)^t$

Next, we plug in $2$ in the formula:

1) $A(t)=100(0.9)^2$     First, solve the squared portion.

2) $A(t)=100(0.81)$    Next, multiply the last 2 numbers.

$A(t)=81$

Terence's account balance after 2 weeks will be C. $81