d(12) means the distance in feet which was able to walk after 12 seconds.
<h3>How to input a function value?</h3>
We are given that she collected data on the number of feet she could walk each second and wrote the following rule to model her walking rate as; d(t)= 4t
Now d(t) represents the distance she walked
t represents time taken to walk a specific distance
Thus;
d(12) means the distance in number of feet which was able to walk after 12 seconds.
d(12) = 4 * 12
d(12) = 48 ft/s
Read more about Function input value at; brainly.com/question/10283950
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