Released STAAR Algebra I EOC · 2025 · Item 47 · 1 point

Walkthrough: Algebra I 2025, Item 47

A.9C · Exponential Functions · unscored study

A bank customer opened a money market account with $2,500. Each year the bank will add interest to the account, which will increase the account’s value by 0.5%. Which function can be used to determine the amount, $A$ , in the account after $t$ years?

$A(t) = 2{,}500(0.50)^t$
$A(t) = 2{,}500(1.005)^t$
$A(t) = 2{,}500 + 0.50t$
$A(t) = 2{,}500(1.005)t$

1. Understand the question

Interest that grows by a percent each year is exponential: $A(t) = a(1 + r)^t$ .

Try the question on your own first, then reveal one step at a time.

2. Solve it step by step

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Question, artwork, answer key and rationale: Texas Education Agency released STAAR test. Walkthrough steps written by TEKSForge. Studying here does not change your mastery or scores.