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Type: Multiple-Choice
Category: Exponents
Level: Grade 11
Standards: HSF-BF.A.1, HSF-BF.A.1a, HSF-LE.A.2
Author: nsharp1
Last Modified: 4 years ago

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Grade 11 Exponents CCSS: HSF-BF.A.1, HSF-BF.A.1a, HSF-LE.A.2

There is a 100 g sample of Sodium-24 sitting in a secure storage box. After 15 hours, there is only 50 g left. Which function best describes this relationship between the amount of Sodium-24,

$S$ , and the time that has elapsed, in hours,

$t$ ?

$S(t) = 100*(1/2)^(15t)$
$S(t) = 100 e^(-0.046t)$
$S(t) = 50*(1/2)^(15t)$
$S(t) = 50 e^(-0.5t)$